You must also bear in mind when talking to Mil ATC that they may be working an awful lot of military traffic on UHF that you don't know about. This may explain why their transmissions are quick. Shawbury will be especially busy at times as it is the Defence Helicopter Flying Training School as well as the Joint Air Traffic Controllers School for the military. If you are ever unhappy about the service they provide or want clarification on something then give them a ring when you land. 9/10 times they will be more than happy to talk and it may be beneficial for them also.