UK AI Inference Hardware & Accelerators

UK companies engineering inference acceleration — the silicon and systems that run large models at production speed in UK data centres.

23 companies listed. Each listing is human-curated by Varadius; Varadius Verified marks companies we have spoken to directly.

Nscale

nscale.com

London-headquartered AI hyperscaler building GPU data centres in the UK. Deploying 60,000 NVIDIA GPUs in the UK and partnering with OpenAI on Stargate UK.

The Sovereign AI Lab. Trains AI models and specialised coding agents for organisations that need frontier capability within secure environments. Public cloud, managed single-tenant, and fully air-gapped deployments. Clients include BT, HSBC, Lloyds, Leonardo, QinetiQ, and Vodafone. London-based.

Fractile

fractile.ai

London-based developer of data-centre inference accelerators for large models. Engineering sites in London and Bristol.

Hostcomm OnshoreAI

hostcomm.co.uk/solutions/uk-sovereign-ai

UK-sovereign open-source LLM inference API running entirely in AWS London (eu-west-2). GDPR and PCI DSS Level 1 compliant. Trading since 2004.

✔ Varadius Verified

NexGen Cloud

nexgencloud.com

UK-based GPU-as-a-service provider offering dedicated VMs and AI workload support in local data centres.

Radiant

ori.co

London GPU cloud offering serverless inference and dedicated clusters for AI teams.

Doubleword

doubleword.ai

Inference cloud for high-volume async and batch LLM workloads. OpenAI-compatible API serving open-weight models (DeepSeek, Qwen, Llama, Mistral). SOC 2 and ISO 27001. London-based, company no. 13353288.

✔ Varadius Verified

Kao Data

kaodata.com

UK-founded and operated data-centre company specifically engineered for AI and HPC workloads. NVIDIA DGX-Ready facilities with high-performance cooling and power infrastructure.

Graphcore

graphcore.ai

Bristol-based designer of AI accelerators (IPUs), with a new data-centre inference chip in development. UK-operating but owned by SoftBank of Japan.

Vaire Computing

vaire.co

UK startup developing reversible-computing chips aimed at near-zero energy consumption.

Redcentric

redcentricplc.com

UK managed services provider with an assured sovereign cloud offering for regulated and public sector workloads.

Stonesthro

stonesthro.co.uk

UK-sovereign AI-ready microedge cloud with 15,800+ distributed sites across the UK Critical National Infrastructure estate. GPU-as-a-service, IaaS/PaaS, Kubernetes. Partnered with Cornerstone and Zadara. NVIDIA GPU-optimised platforms.

✔ Varadius Verified

Pulsant

pulsant.com

UK sovereign AI-ready data centres. Infrastructure platform is fully UK-owned and built on UK data centres, serving regulated and public sector workloads.

Lumai

lumai.ai

Oxford spin-out building 3D free-space optical compute. Iris Nova server runs billion-parameter LLMs in real time at up to 90% lower energy.

✔ Varadius Verified

Oriole Networks

oriolenetworks.com

UCL spin-out developing photonic networking technology for AI/ML and HPC workloads.

✔ Varadius Verified

Optalysys

optalysys.com

Yorkshire-based optical computing company accelerating fully homomorphic encryption, enabling computation on data that is never decrypted.

✔ Varadius Verified

Ark Data Centres

ark-d-c.com

UK-owned and operated data-centre group with a strong government and defence customer base, now building AI-capable capacity. Trusted strategic partner since 2010.

✔ Varadius Verified

DataVita

datavita.co.uk

Scotland's largest independent data-centre and cloud operator, offering UK-sovereign hosting for regulated workloads.

✔ Varadius Verified

Platform DC

platformdc.io

Modular AI data centres for generative, agentic and physical AI. Solves scalability and efficiency challenges of delivering AI infrastructure. High-performance, sustainable, deployable anywhere. Warrington, UK.

✔ Varadius Verified