Specialist Computer Centres plc

PSN OFFICIAL - Hosted Desktop as a Service - Sentinel by SCC

Delivered as a fully managed virtual desktop (VDI) solution from dual UK data centres with 24/7 UK SC cleared support. Sentinel, by Specialist Computer Centres (SCC), keeps data secure to NCSC (previously CESG) security standards (OFFICIAL and OFFICIAL sensitive). PSN and Cyber Essentials Plus (CE +) Certified. PSN Connectivity.


  • Windows 7 & 10 operating system and Anti-Virus
  • Office Suite 2016 standard with PDF Reader and Zip Utility
  • Enterprise Virtual Desktop Infrastructure (VDI) Technology Standards
  • Shared Business Drives
  • Virtual Desktop Persistence
  • Optional Collaboration – Exchange/Skype for Business
  • Internet Explorer/Chrome browser options
  • ISO 27001, ISO 9001, ISO 14001, ISO 20000 quality standards
  • PSN certified Hosted Desktop as a Service (DaaS)
  • Cyber Essentials Plus (CE +) platform security accreditation


  • Customers can use their Microsoft licensing via appropriate mobility agreement
  • Standardized corporate desktop & office software
  • Scalable Virtual Desktop Solution allowing growth to meet business demand
  • Fully GPG 13 Compliant (DETER) Service
  • Secure network interconnect capability to HSCN, PNN, CJX and RLI
  • Virtual desktop pay as you go model providing scalable usage
  • Dual site high availability supporting Business continuity and Disaster Recovery
  • Delivered by UK based Security Cleared (SC) staff
  • 24x7 virtual desktop (VDI) support
  • Self-service portal for administration and users


£55.00 per user per month

Service documents


G-Cloud 11

Service ID

1 0 5 8 0 4 8 0 1 1 3 2 5 2 2


Specialist Computer Centres plc

Mike Nelson



Service scope

Service scope
Software add-on or extension Yes, but can also be used as a standalone service
What software services is the service an extension to Can be used in conjunction with Sentinel's Managed Desktop, Skype, Secure File and Sharing, Email and/or Email Archive SaaS offerings
Cloud deployment model Public cloud
Service constraints SCC will not provide any application or middleware level support as part of the service offerings described within this agreement.
System requirements
  • Connect via an approved network connection
  • Meet the requirements of the associated Code of Connections

User support

User support
Email or online ticketing support Yes, at extra cost
Support response times Priority Response 1 - 30 mins,
Priority Response 2 - 60 mins,
Priority Response 3 - 4 Hrs
Priority Response 4 - 72 Hrs

Support is available up to 24/7
User can manage status and priority of support tickets No
Phone support Yes
Phone support availability 24 hours, 7 days a week
Web chat support No
Onsite support No
Support levels Only one support level and all included within the SaaS offering for items under the scope of the service
Support available to third parties Yes

Onboarding and offboarding

Onboarding and offboarding
Getting started All new customer opportunities are run as a project, as part of this there is a discovery and transition phase which help identify the customer requirements and bring them into the service. Transition, Project and Service Delivery Managers are also assigned to assist customer into the service.
Service documentation Yes
Documentation formats PDF
End-of-contract data extraction The virtual machine file, together with the configuration files shall be supplied to the Customer using either encrypted media as appropriate. SCC will then destroy all live and backup copies of the virtual machine file and data within our control in line with NCSC guidelines and provide written.
End-of-contract process SCC will work with the Customer to create an exit plan and strategy within 3 months of the start of service. This is included in the price of the contract. The exit plan will define what happens at the end of the contract.

Using the service

Using the service
Web browser interface No
Application to install No
Designed for use on mobile devices No
Service interface No
Customisation available Yes
Description of customisation Non-standard software & applications can be installed.
Can also change infrastructure set-up for Intensive or Specific Performance Workloads.
DPAs (Dedicated Physical Assets) allowing customers to install their own hardware
Non-standard software & applications can be installed.
Customer machine images.
Custom devices.

Done as part of service design, user/customer requirements taken on board


Independence of resources QoS policies in place to ensure secure segregation is in place.

All customers and their users must agree to the Acceptable Usage Policy.


Service usage metrics Yes
Metrics types We can provide CPU, Disk, Memory, and Network metrics
Reporting types
  • Real-time dashboards
  • Regular reports


Supplier type Not a reseller

Staff security

Staff security
Staff security clearance Other security clearance
Government security clearance Up to Developed Vetting (DV)

Asset protection

Asset protection
Knowledge of data storage and processing locations Yes
Data storage and processing locations United Kingdom
User control over data storage and processing locations No
Datacentre security standards Complies with a recognised standard (for example CSA CCM version 3.0)
Penetration testing frequency At least once a year
Penetration testing approach ‘IT Health Check’ performed by a CHECK service provider
Protecting data at rest Physical access control, complying with another standard
Data sanitisation process Yes
Data sanitisation type Explicit overwriting of storage before reallocation
Equipment disposal approach Complying with a recognised standard, for example CSA CCM v.30, CAS (Sanitisation) or ISO/IEC 27001

Data importing and exporting

Data importing and exporting
Data export approach Customers send a specific keypad locked USB HDD (unlock-codes-sent-separately).
The HDD is unlocked then plugged into the first Sheep dip server which is internet outward facing but not internally connected to the SCC Sentinel network. This server runs the latest up to date F-Secure’s AV and Malware protection program against the USB HDD. HDD is then connected to 2nd sheep dip box which is SCC internally facing only. This server runs the latest up to date Symantec End Point protection AV and Malware protection program against the USB HDD. Data is exported to the device securely sent to the customer.
Data export formats
  • CSV
  • ODF
Data import formats
  • CSV
  • ODF

Data-in-transit protection

Data-in-transit protection
Data protection between buyer and supplier networks
  • TLS (version 1.2 or above)
  • IPsec or TLS VPN gateway
  • Other
Other protection between networks Separate management platform for accessing Customers. Management platform utilising firewalling and proxy layers to access Customers. Proxy layer contains different jumpboxes to access different management domains, which present different access methods to and from Customers. Customer tenancy severs require backend private VLAN interfaces for SCC Sentinel Management access and logging.
Data protection within supplier network
  • TLS (version 1.2 or above)
  • Other
Other protection within supplier network IPS, Use of secure protocols TLS,SSH for services where possible, Private VLAN's to isolate Customer environments

Availability and resilience

Availability and resilience
Guaranteed availability Service comes with a 99.95% SLA
Approach to resilience Leveraging Sentinel's IaaS offering the HDaaS is deployed in a highly available, no single point of failure configuration. The service also makes use of SCC’s secondary Data Centre as a cold standby facility in the event of a disaster recovery scenario.
Outage reporting Monitoring with SCC toolsets

Identity and authentication

Identity and authentication
User authentication needed Yes
User authentication
  • 2-factor authentication
  • Public key authentication (including by TLS client certificate)
  • Limited access network (for example PSN)
  • Dedicated link (for example VPN)
  • Username or password
Access restrictions in management interfaces and support channels The Sentinel management estate used by SCC is a physically separate estate with the same controls and security in place on the multi-tenancy platform. This service like the rest of the IaaS is accredited by the PSN.
Access restriction testing frequency At least every 6 months
Management access authentication
  • 2-factor authentication
  • Username or password

Audit information for users

Audit information for users
Access to user activity audit information Users contact the support team to get audit information
How long user audit data is stored for Between 6 months and 12 months
Access to supplier activity audit information Users contact the support team to get audit information
How long supplier audit data is stored for Between 6 months and 12 months
How long system logs are stored for Between 6 months and 12 months

Standards and certifications

Standards and certifications
ISO/IEC 27001 certification Yes
Who accredited the ISO/IEC 27001 LRQA
ISO/IEC 27001 accreditation date 28/07/2015
What the ISO/IEC 27001 doesn’t cover N/A
ISO 28000:2007 certification No
CSA STAR certification No
PCI certification No
Other security certifications Yes
Any other security certifications
  • PSN Assurance
  • Cyber Essentials Plus

Security governance

Security governance
Named board-level person responsible for service security Yes
Security governance certified Yes
Security governance standards ISO/IEC 27001
Information security policies and processes All our security policies are aligned to and certified to ISO 27001:2013

Operational security

Operational security
Configuration and change management standard Conforms to a recognised standard, for example CSA CCM v3.0 or SSAE-16 / ISAE 3402
Configuration and change management approach All our configuration and change management processes are aligned to and certified to ISO 27001:2013
Vulnerability management type Conforms to a recognised standard, for example CSA CCM v3.0 or SSAE-16 / ISAE 3402
Vulnerability management approach SCC's vulnerability scanning and penetration testing policy documents the process and how vulnerabilities are proactively detected and remediated in a timely fashion. SCC performs monthly vulnerabilities across the Sentinel platform covering approximately 20% of the platform each month, ensuring the whole platform is covered twice within a 12 month period.
Protective monitoring type Conforms to a recognised standard, for example CSA CCM v3.0 or SSAE-16 / ISAE 3402
Protective monitoring approach Protective monitoring is carried out in accordance with GPG 13 to level B (Deter)
Incident management type Conforms to a recognised standard, for example, CSA CCM v3.0 or ISO/IEC 27035:2011 or SSAE-16 / ISAE 3402
Incident management approach All our incident management processes are aligned to and certified to ISO 27001:2013 as defined in HMG Cloud Security Guidance: Standards and Definitions

Secure development

Secure development
Approach to secure software development best practice Supplier-defined process

Public sector networks

Public sector networks
Connection to public sector networks Yes
Connected networks
  • Public Services Network (PSN)
  • Joint Academic Network (JANET)
  • Health and Social Care Network (HSCN)


Price £55.00 per user per month
Discount for educational organisations No
Free trial available No

Service documents

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