Martyn,
I'm pretty sure I bought that FM1 off you, c.12yrs ago, and it still works a treat. Still on the same set of valves! (The bag of spares you supplied remains in hand)
Sorry to report that PSU however died very quickly in a cloud of smoke - secondary cooked-out fortunately while I was around to hit the mains switch. With that I also shed the decoder board, but wasn't using it anyway - preferring the S:N silence of unfettered mono.
Soon after I bought a mint AM2 just to keep it company, simply for the design.
Regards
Martin