IoT-Bay (an interoperability hub for IoT services) includes SH&BA, EDF Energy, IBM UK, Westminster City Council, BRE and University of Bristol.
i-MOVE (for moving objects, including vehicles) includes Aimes Grid Services, BT, Traak, Avanti, Placr, Merseyside Transport
International airports: LivingPlanIT, London City Airport, Milligan Retail, Critical Software, AppSherpas, HWC, CrowdVision, and ECM
OpenIoT: 1248.io, ARM, AlertMe, Enlight, Intellisense.io and Badger Pass
Smart Streets: InTouch, Carillion, BalfourBeatty, Amey, Lancaster University
Stride (smart transport IoT data ecosystem): BT, Aimes, Ctrl-Shift, University of Cambridge, Dartt
TSB recently announced a Launchpad programme for companies wanting to get involved in IoT development.
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