Thanks for the input guys, it's very much appreciated.
Well I'm pleased to say I have it sorted.
I ended up with with light going off when T09 on the RF board was screwed right in but so much I lost all signals, and conversely unscrewing brought the signals flooding back and the light staying on. Looking at the circuit drawing I could see how T09 handled both the on going signals but also a feed down to T06 via Q05 and in turn eventually to PL3, so I figured they could be an issue with Q05. Tested it in circuit and got some odd results so chopped it out for a new one.
Turned the set back on and with a little adjustment of T09 and T06, have more signals than I know what to do with, and the light goes off every 1Mhz from the top to the bottom.
As I said from the start, I have very little technical knowledge but do have a fairly good sense of problem solving.
The frequency counter proved invaluable in getting a few things straightened up, but not so much the signal generator as approaching it methodically it seems good hearing is enough to bring it inline. I have gone over it with the generator and found very little to do.
Again many thanks for all the info and support.
All the best.