^This.
For GBP you can also use Coinfloor. Not quite the liquidity of Coinbase, but decent support and no problems cashing out. I've used both and localbitcoins over the years.
I've not read good things about Coinfloor. They also don't seem professional in the slightest. Some of their policy changes have been so extreme customers thought it was an April fool until they confirmed it. I wouldn't want to touch them either.
Coinfloor? One name: nefario. 'Nuf said.
OTOH, Coinbase has done well by me. Their tech support lagged in the 2017 FOMO phase, but they've given that part of the business industrial strength attention.