I've used gemini successfully as my primary exchange, with Kraken a s aback up. Though they can be dicks about allowing GBP deposits.
nostr:nprofile1qqsvn0dkjt80raqrxd470c98n7zrdehmcvj6p5hgw3kyku6zyd8z0fqpzamhxue69uhhyetvv9ujumn0wd68ytnzv9hxgtc9psx07 e is also a good second or third option.