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Since most sets have had parts removed how difficult is it to find replacements?
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It depends what parts you want. As suggested earlier your best bet would be to contact VMARS
https://www.vmars.org.uk/ as well as putting requests in the Wants section of this Forum. You will be unable to source exact replacement working capacitors. With a lot of extra effort you should be able to drill out and restuff the existing metal cased capacitors with modern components, which are much smaller, and thus retain original appearance, but to get the metal cased capacitors out from the coil box would entail a complete dismantling. If you get sight of an R1155 then take a look underneath inside and you'll see just how much work is involved to access the mounting nuts for these components. Note that there were different variants
https://en.wikipedia.org/wiki/R1155 some with different frequency coverage and some without direction-finding (DF). Unless you want a museum exhibit, you aren't going to get much fun out of restoring the DF parts of the circuit since it won't do anything useful on the ground. That's why most people remove those valves. Getting the parts for the DF displays would probably be challenging. The original power supply units do turn up but, like the radio unit, would need restoring and unless provided for ground school operation would probably only be suitable for aircraft-derived input power, not domestic mains. If you were content to use it just with headphones you could save the trouble of sourcing an external AF amplifier, although that would probably be the cheapest and easiest part. Cheers, Jerry