Here is the list of UK bitcoin ATM operators and a number of machines they run:
SatoshiPoint | http://satoshipoint.co.uk/ | 13 |
CeX | https://uk.webuy.com/ | 5 |
FutureCoins | http://futurecoins.co.uk/ | 4 |
Cointrader | https://www.cointrader.net/bitcoin-atm-locations | 1 |
BitBuddy | http://bitbuddyatm.com/ | 1 |
Bit2Bit | http://bit2bit.co/ | 1 |
So contacting Jonny from satoshipoint is probably the best idea.
There are also couple of manufacturers in Europe, e.g. General Bytes in Prague or Germany based bitXAtm, but I'm not sure if this makes sense to do this, so agreeing with local operators makes much more sense.