In the UK, Ambulance Services are run entirely separately from Fire Services. As far as I know no ambulance service in the UK employ EBME technicians directly but have a contract with the EBME department at the nearest major hospital, eg Lincolnshire Ambulance have a contract with Lincoln Clinical Engineering to maintain their defibs, pulse oximeters and sphygmomanometers. I personally do a lot of the PPM work on Lincs ambulance gear. If you have any specific questions - I may be able to answer them ( within reason ) but I don't want to breach confidentiallity as far as the contractual relationship between Lincs Amb and Lincoln CEng is concerned.