Wow, Revell customer service seems a lot better than Airfix. I sent a request for a spare Churchill part (one of the track springs) to Airfix and they didn't even seem to read my email properly as they asked me to tell them the part and kit number again even though i'd included it, then they said they wanted £4 for the piece, then when i said how absurd that price was they said that was wrong and they really wanted £3. £3 for a tiny part of a £6 kit. I refused that, obviously, so that Churchill kit is never getting finished unfortunately.
Revell on the other hand, years ago i accidently glued the track wheels on a jagdpanther on backwards, meaning i had the lower chasis of it now useless and couldn't sort it out. Last month after finding out they even do spare parts I requested the entire bottom half of the chasis and those 8 wheels again, i didn't expect they'd actually do it, but i just had it turn up. I never even got a reply to my request but that also means i didn't have to pay postage or anything at all!