IT Support & IT Services in London

In London, 3 of 323 IT providers carry the Assurix Trustmark, meaning they have been independently assessed against the NCSC Cyber Assessment Framework. Each verified provider commits to continuous re-assessment, so their security posture stays current between audits — not just at renewal time.

What to look for in a London provider

Daily support barely depends on where a provider sits. Onsite response depends on it a lot. Weigh both sides.

A written onsite response time

Ask what happens when something needs hands on a machine, not just a remote session. In central London a good provider can usually get someone to you fast, so get the target time in the contract rather than as a verbal promise.

Experience with firms like yours

London has a heavy concentration of legal, financial and professional services firms. A provider who already supports your sector will recognise the security evidence your clients, insurers and regulators tend to ask for.

Coverage if you have more than one office

Plenty of London businesses run a second site or hybrid staff across the city. Check the provider can reach every location you operate, not only your registered address.

Out-of-hours and weekend cover

City firms often work outside nine to five. Ask whether support outside office hours is included, who answers, and whether it's the same team or an overflow desk.

How they handle hardware and moves

Office churn is common in London. Ask how the provider deals with kit delivery, secure disposal and moves between buildings, and whether that sits inside your agreement or costs extra each time.

Questions worth asking before you sign

A short list you can put to any provider on this page. The answers tell you more than a polished website will.

1. If a device fails on site, how quickly can an engineer physically reach us, and is that time in the contract? It separates a real commitment from a friendly guess.
2. Which sectors do you support most, and are any regulated? A provider who knows your regulator already needs less hand-holding on evidence.
3. How do you prove our security is in a good state, month to month? Continuous evidence is more useful than a certificate from last year.
4. Who picks up if we call at 9pm on a Friday? You want to know whether it's your team or an unfamiliar overflow desk.
5. Can you support both our offices and our remote staff? Multi-site cover across the city is easy to assume and easy to get wrong.
6. What happens to our data and old kit when we replace a laptop? Secure disposal is a common gap, and it's your liability if it goes wrong.

IT providers in London

323 managed service providers are listed in London.

Showing 50 of 323 providers. View all 323 providers.

Towns served in London

IT support providers in London are based across the following towns. Towns with five or more listed providers link to their own directory page.

• London (311 providers)
• Greater London (7 providers)
• Middlesex (1 provider)
• Southgate (1 provider)
• Surrey (1 provider)
• Uk (1 provider)
• England (1 provider)

Browse nearby regions

• South East IT providers
• East of England IT providers

How much does local really matter in London?

Start with the honest answer. The bulk of modern IT support is remote: monitoring, patching, helpdesk, security work. For that, a provider's postcode barely registers. What their address does affect is the day someone has to be physically present, for a failed server, a new office, or a sit-down review with your leadership team.

London's real feature is density. There are more providers here than in any other region on this directory, which flips the buyer's job from finding one to filtering many. That's an advantage if you use it well. You can hold out for a provider who commits to an onsite time in writing and already understands your sector.

Because so many legal, financial and professional services firms are based in the city, a large share of London providers have built their offer around those industries. If you're in one of them, that specialism is worth seeking out.

What Assurix verification tells you here

Assurix is an independent trustmark for UK IT providers, built on the idea of proof, not promises. A provider carrying the Trusted MSP badge has passed all 64 controls, aligned to the NCSC Cyber Assessment Framework, and stays under continuous monitoring rather than a yearly audit. Providers carrying it are shown first, and any working toward it are listed as On the Journey within a six-month window. The rest are simply not yet Assurix-verified.

Frequently asked questions

Does my IT provider actually need to be in London?

For most of what a provider does, the answer is no. Helpdesk, monitoring, patching and security work all happen remotely, so a provider across the city serves you much the same as one down the road. An address earns its keep on the days someone has to be in the room: a hardware failure, an office move, or an in-person review. If those matter to you, ask for a written onsite response time. If they rarely come up, weigh experience and evidence over distance.

There are hundreds of providers listed. How do I narrow it down?

Start by filtering, not reading every profile. Decide the two or three things that matter most to you, such as sector experience, an onsite response commitment, or continuous security evidence. Then shortlist providers who clearly meet them and ignore the rest. London's density is on your side here: with this many providers, you can afford to hold out for a strong match rather than settle for the first decent website you land on.

What does 'Trusted MSP' next to a London provider mean?

It means the provider has passed all 64 Assurix controls and kept that status under continuous monitoring, with an annual reassessment. The controls are aligned to the NCSC Cyber Assessment Framework. If a control slips, the provider has 30 days to fix it, and if they don't, the badge is suspended and removed from their listing. So it tells you how a provider runs security today, and that it's being kept current.

My provider isn't Assurix-verified. Should I be worried?

No. 'Not yet Assurix-verified' is a neutral label. It only means a provider hasn't been through the Assurix process, and many excellent London firms haven't. Plenty hold their own certifications, such as Cyber Essentials or ISO 27001, and run tight operations. The label is a prompt to ask how a provider evidences its security, rather than a mark against them. Verification gives you independent, continuous proof, which some buyers value and others weigh alongside everything else.

Can one provider cover our head office and staff working from home?

Usually, yes, but confirm the detail. Many London businesses run a second office or have staff spread across the city and working from home. Ask whether the provider's agreement covers every site and every remote worker, or only your registered address. Check how they handle a support call from someone at home, and whether onsite response applies to all your locations. Getting this clear up front avoids a surprise the first time a remote employee needs hands-on help.

Related pages

• MSPs and IT support in the South East
• MSPs and IT support in the East of England
• IT support for legal firms
• IT support for financial services
• IT support for professional services

What to ask an IT provider in London

Use these questions when evaluating any IT support provider in London, regardless of size or certification status.

1. How do you demonstrate that our systems stay protected between audits — not just at certification renewal? Verified IT support providers use continuous monitoring, not one-off assessments. Ask to see a live dashboard or a recent compliance report before signing.
2. Which cybersecurity certifications do you hold, such as Cyber Essentials Plus or ISO 27001, and are they current? Certifications expire. Always ask for the certificate date and the issuing body, and check whether the scope covers the services you are buying.
3. What is your guaranteed response time for a critical incident, and who is responsible out of hours? Response SLAs vary widely. Confirm whether the SLA covers resolution or acknowledgement only, and ask who you actually reach at 2 am on a Sunday.
4. How do you handle a security breach — who do you notify first, and what does your recovery process look like? UK GDPR requires breach notification within 72 hours. Your IT provider should have a documented incident response plan and be willing to share it.
5. Can you share references from clients in a similar sector or of a similar size? A provider experienced in your industry already understands your regulatory context, common threat patterns, and the compliance questions your clients ask.
6. What is included in your monthly fee, and what would be charged as an extra? Common add-on costs include out-of-hours callouts, additional users, hardware replacements, and advanced security tools. Get the full scope in writing before you commit.