I agree with mad-jock on "Aircraft Performance Theory for Pilots" by P. J. Swatton.
I found the "Dictionary of Aeronautical Terms"* useful (compiled and edited by Dale Crane - it's American). Contains a concise paragraph on everything you can think of like "hung start", "hydraulic actuator" and "mach tuck" - these terms will mean something when you get into the ATPLs.
* Available from all the usual Pilot Shops