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it is fb, but there's a UK 'buy, sell, trade drums' group which is decent enough, got a double-pedal and a cymbal from a couple of different people on there in the past few years without any issues. (edit: i used this one https://www.facebook.com/groups/507827252616774 - there's another version that's not '(2)', not sure what the difference is)
also bought lots of used stuff here: https://www.grahamrusselldrums.com/pre-owned/used-drum-hardware/ though can't see the pedals you're after in stock at the mo.
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Reverb would be my go to usually... also Adverts is a local Irish sales platform that has a lot of music gear on it and most people would be cool about shipping.
I've definitely had good results with those Facebook groups too though and there would be some good brand specific ones worth checking out, just start searching in FB groups for whatever keywords you're after...
Any suggestions for places online to look for secondhand gear? Other than eBay/Facebook. Even better, does anyone want to sell me a Pearl Eliminator Redline double pedal?