Apart from Heathrow and London City, and Malaga which bans VFR on some days, and no doubt others I don't know about, you can fly VFR or IFR to any airport in Europe.
Gatwick is 24hrs PPR and ~£500; similarly with Luton, Stansted, Frankfurt, Munich, etc, etc. But you "can" just fly there. All the big ones are "mandatory handling" and you just get a super smooth handling agent (used to doing bizjets at £1000 a pop) who sorts everything out - unlike the airport admin dept which is often run by total morons. This is, Sir, how aviation is supposed to work
Check out Harrods Handling at Luton. And it does work. Very slick, usually. The handling agent will, if appropriate, bribe the airport manager to lubricate the PPR and find parking... (Italy, Greece). They even hand you tafs/metars before you depart
Then you have loads of £200 airports. Prague is getting that way. I paid that in Tirana. Athens. Aberdeen...
Then you have loads of £100 airports; too many to start to mention.
We all know the £50 ones: Bournemouth, Norwich, etc.
But you can fly to all of these. Just costs money, and sometimes PPR.
The UK is quite unusual with LHR and LCY in the total GA ban.