My fave UK exchange has closed :/

I have used localbitcoins.com ever since I've had bitcoin and never had a problem but I went there today to cash some in and they have closed :sob:

I have no idea what other UK exchanges are trustworthy. A quick google suggested eToro but that looks more like a general purpose trading app than an exchange. I want to cash out about 15K GBP in the next week or two so registration / authorization / approval would need to be pretty quick and straightforward. UK people, who is legal, reliable for that these days? Obviously we're only talking well established exchanges here, please no private trade offers or no-name exchanges! ;-)