[John G8MWF]

The crystal for 433.05, that only cost me £5, arrived this morning and tuned up in no time. The only surprise was how little the core of L1 had to be adjusted into the coil.
This leads me to believe that this part of the radio may have been modified, very very nicely, in an earlier life?

I looked for other peaks in the coil but there was only the one.

Naturally the set needs tuning up properly with a signal generator as my only TX source is a handheld set using a dummy load. Not the ideal source for setting up with!

So it looks like I have a fighting chance of getting onto 70cm but I will have to source the proper test kit to see just how well the set will work.

Thank you all for your excellent advice - much appreciated.