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Might be Hillingdon's kit..
http://hillingdoncyclecircuit.org.uk/ -
Yes, we use them for the 10s at Hillingdon.
They are expensive, something like £80 each, plus the software.
We needed to get a few new ones a couple of years ago and researched the alternatives but, surprisingly, there wasn't anything cheaper. After we'd got the new ones we did find someone who could fix our old ones, opening them up to put a new battery in. We had to post them to Australia to have it done.
The system works very well: very few missed passes.
Thanks Hippy, my searches on their use by clubs mostly take me to Australia.
We want to use them for our 10s @ Lea Valley so I will chase up the contact with Frank and the Westerley