Specialist Computer Centres plc

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

Delivered as a fully managed Windows or Apple end user device (EUC) desktop service from dual Tier 3 + UK data centres with 24/7 UK SC cleared support.
Secure to NCSC (previously CESG) security standards (OFFICIAL and OFFICIAL sensitive). PSN and Cyber Essentials Plus (CE +) Certified. PSN Connectivity.


  • Windows 7 /10 Enterprise or macOS Sierra (10.12+) & Anti-Virus
  • Full Hard disk encryption
  • Policy based content and software distribution
  • NCSC Aligned Security Policies
  • Compliant Password Policies
  • Self-Service managed device portal via PSN or Remote Access
  • Optional Office Suite, Exchange/Skype for Business & customer applications
  • ISO 27001, ISO 9001, ISO 14001, ISO 20000 quality standards
  • PSN certified Managed Desktop as a Service (MDaaS)
  • Cyber Essentials Plus (CE +) platform security accreditation


  • Service aligned to Cabinet Office End User Device Guidance
  • Software and Content Distribution
  • Customers can use their Microsoft licensing via appropriate mobility agreement
  • Standardized corporate desktop & office software
  • Fully GPG 13 Compliant (DETER) Service
  • Secure network interconnect capability to HSCN, PNN, CJX and RLI
  • Managed 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 managed desktop support


£35.00 per device per month

Service documents


G-Cloud 11

Service ID

8 1 2 6 4 0 1 3 8 2 6 9 2 1 3


Specialist Computer Centres plc

Mike Nelson



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 Hosted Desktop, Skype, Secure File and Sharing, Email and/or Email Archive SaaS offerings
Cloud deployment model
Public cloud
Service constraints
Access to non-standard software requested by a customer will need to go through a due diligence check and could be refused. Access to these applications will be controlled via an appropriate toolset and set via security group on the SCC provided control panel. SCC responsibilities for these applications includes packaging and installation all via the SCC change process. The Customer is accountability includes proactively identifying patches, testing of any packaging of the software and any tasks required around the security or support of the non-standard software.

All constraints are detailed in the Service Description.
System requirements
  • Connect via an approved network connection
  • Meet the requirements of the associated Code of Connections

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
Phone support
Phone support availability
24 hours, 7 days a week
Web chat support
Onsite support
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

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
Documentation formats
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

Web browser interface
Application to install
Designed for use on mobile devices
Service interface
Customisation available
Description of customisation
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


Supplier type
Not a reseller

Staff security

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

Asset protection

Knowledge of data storage and processing locations
Data storage and processing locations
United Kingdom
User control over data storage and processing locations
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
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 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 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

Guaranteed availability
Service comes with a 99.95% SLA
Approach to resilience
Leveraging Sentinel's IaaS offering the MDaaS 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

User authentication needed
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

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

ISO/IEC 27001 certification
Who accredited the ISO/IEC 27001
ISO/IEC 27001 accreditation date
What the ISO/IEC 27001 doesn’t cover
ISO 28000:2007 certification
CSA STAR certification
PCI certification
Other security certifications
Any other security certifications
  • PSN Assurance
  • Cyber Essentials Plus

Security governance

Named board-level person responsible for service security
Security governance certified
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

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

Approach to secure software development best practice
Supplier-defined process

Public sector networks

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


£35.00 per device per month
Discount for educational organisations
Free trial available

Service documents

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