Angry,
Yes, you are correct the costs quoted are to the ratepayer so-to-speak. Have had some good and bad times in the 105 - but she never let me down, when a donk ate something mettalic and ******ed the compressor!! Mr Alison/RR with the C20B does not have the best of histories, but when used in a police role they are hardly up to temp when needed to work - they can leak a bit too, but the oil loss needs to be around one liter per hour before the limit is reached - messy to clean up if you leave it too long.
regards FLIR.