The UK CAA has published a nice Safety Sense Leaflet. Safety Sense Leaflet 22 deals with radiotelephony for general aviation (GA) pilots. It discusses all the standard procedures for departure, en route and arrival along with radio failure and lost procedures.
UK CAA Talking Radio Telephony
The UK CAA has recently released this podcast which discusses radiotelephony from the perspective of two flight instructors who are also FRTOL examiners.