Yes they currently do not support it. As per their statement, you have to convert your GBP to euros first
At this time Coinbase does not support bank deposits or withdrawals of British pound sterling (GBP).
In order to withdraw GBP, Coinbase will convert funds to Euros (EUR) and send them to your linked SEPA-compatible bank account.
And to answer your 2nd question, Yes they are working on it:
We are working hard to bring back GBP wires as soon as possible