Well done Shaun, by persisting you now have a working Roberts and have learnt a bit about them in the process
Regarding R2, make sure you're using a good PP9 as FM is the first band to go iffy when the battery begins to run down. Are other FM stations ok and with good volume and no distortion at higher volume ? If not a weak battery, all I can suggest otherwise is an alignment problem.
Good luck with the VTR103s, but remember to start a new thread if you require any help with them. They're very easy to work on and nowhere near as problematic as certain Roberts sets can be.