Currently, direct withdrawals from your Coinbase EUR balance to your verified UK bank account aren't supported. However, you can withdraw from your EUR balance via a SEPA transfer.
Alternatively, if you'd like to convert your funds from EUR to GBP and withdraw, follow these steps:
Buy cryptocurrency using all the funds in your Coinbase EUR balance.
Sell cryptocurrency to your GBP balance.
Withdraw from your Coinbase GBP balance to your UK Bank Account via Faster Payment transfer.