Hello John, thanks for your reply, l am going to call into my local garage for a diagnostics result, just took the car there for the MOT seems a decent bloke, see how that goes, strange about the radio though, usually manage through trial and error to fix small issues as they arise, but as you say, l need to pinpoint the cause or just keep throwing money at maybe faults. Took the car to an independent jag specialist in Milton Keynes once for a problem, very good very reasonable but a fair distance away, could be another visit there l think!
Thanks again John.