I reckon you'd be best off selling anything even remotely valuable (e.g. Marvel comics) via eBay or suchlike.
At, Car boot sales, everything seems to be on sale for about 10p each - I very much doubt you'd get a couple of quid for a Guinness book of records, for example.
So if you've got 10,000 small items, they're great - get rid of most of them all in one go, and make maybe £100 out of it.
Otherwise, eBay.
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