TET Ltd

London

Send an enquiry Visit tet.co.uk How to check an IT provider

Assurix Trusted MSP

Assurix Trusted since 2026

Certificate number: TMSP-TETLIMITED-2026-0924-01
Valid until: 24/09/2027

Independently assessed by Assurix on 59 controls across security and service. It passes all of them, with live evidence from its own tools. A failure left unfixed for 30 days suspends the Trustmark publicly. Live-measured controls are checked every six hours, the rest on a set cycle. Assurix assesses IT providers. It isn’t one.

Ask TET Ltd for its Trust Portal link. It shows what Assurix checks and today’s result.

About TET Ltd

In TET Ltd’s own words. Assurix hasn’t checked this.

Transforming Every Tomorrow.

Technology should move your organisation forward, not hold it back. For more than 40 years, we've helped organisations navigate change, modernise their technology estates, and unlock new opportunities through intelligent IT solutions. As a vendor-agnostic Managed Service Provider, we work alongside our customers to design, deliver, support, and optimise technology that aligns with their business goals. From modern workplaces and hybrid infrastructure to cybersecurity, cloud, and managed services, we provide the expertise, partnerships, and operational support organisations need to thrive in an increasingly digital world. What makes us different is our approach. We don't start with products. We start with understanding your organisation, your challenges, and your ambitions. By combining deep technical expertise with a consultative mindset, we help you make informed decisions that deliver measurable outcomes today while building a foundation for tomorrow. Whether you're looking to improve user experience, strengthen security, optimise costs, modernise infrastructure, or accelerate digital transformation, our team becomes an extension of yours, providing guidance, support, and innovation at every stage of the journey. Today, organisations across the public and private sectors trust us to manage critical technology environments, deliver strategic projects, and help them navigate an ever-changing technology landscape. Because technology isn't just about solving today's challenges. It's about transforming every tomorrow.

Email: info@tet.co.uk
Phone: +44 20 7553 3990
Listed in: London, South East
Sectors: Legal, Healthcare, Financial Services, Manufacturing, Education, Professional Services, Public Sector, Non-profit, Hospitality, Construction, Technology, Retail & E-commerce
Specialisms: Microsoft 365, Azure, SIEM/SOC, Endpoint Security, Network Infrastructure, VoIP & Telecoms, Backup & Disaster Recovery, Cloud Migration, Compliance & GRC, Identity & Access Management
Certificates it lists: Cyber Essentials, Cyber Essentials Plus, ISO 9001, ISO 14001, ISO 27001, GDPR Certified; A certificate is a good start. It shows a check passed on one date.
Founded: 1985, 41 years trading, as TET Ltd lists it
Companies House: 01923808, incorporated 19/06/1985
At Companies House: Company active, accounts up to date, as at 08/11/2026.
Staff: 100, as TET Ltd lists it
On Google Maps: Google rating 4.8 from 4 reviews; Checked 09/11/2026. It plays no part in the Directory’s order.

Where TET Ltd is

The pin is a postcode or town centre, which can be a registered office.

MSP (managed service provider) is the industry’s name for an IT provider that looks after your systems.

Report a correction

Tell us what’s wrong on TET Ltd’s listing and where we can check the right detail.

What the NCSC tells businesses to check.

The National Cyber Security Centre’s guide lists what to check before you choose an IT provider. Here is what TET Ltd’s Trustmark already covers, and what to ask TET Ltd.

CheckWhat the NCSC saysWhat TET Ltd’s Trustmark covers

PatchingSoftware patched within 14 days of an update being released.Checked by AssurixAssurix measures patching live from the provider’s own tools.

BackupsWhat is backed up, how often, where it is stored, and how often restores are tested.Partly checkedAssurix checks the provider can restore its own backups. Ask how yours are tested.

Access2-step verification, admin accounts only for people who need them, and how the provider connects into your systems.Checked by AssurixAssurix checks sign-in, admin accounts and the tools that reach into your systems.

ContractWhat is included, how incidents are reported, response times, and what happens if you leave.Partly checkedAssurix checks service commitments are in the contract and that leaving is handled properly. Read the terms yourself.

ReferencesReferences, testimonials or case studies from other small businesses.Ask the providerNot part of the Trustmark. Ask for references from businesses like yours.

Source: NCSC, Choosing a managed service provider (MSP).

Send TET Ltd an enquiry

Say what you need. Assurix passes your enquiry to TET Ltd, who may contact you about it. Free, and no obligation.

Or call TET Ltd on +44 20 7553 3990.