Could you please elaborate on the issue you're facing with withdrawing GBP from Coinbase? Are you encountering any specific error messages or is there a delay in the withdrawal process? It's important to note that Coinbase, like many cryptocurrency exchanges, has specific requirements and limitations for withdrawing fiat currencies like GBP. These can include minimum withdrawal amounts, verification processes, and potential restrictions based on your account status or location.
Have you ensured that your account is fully verified and meets all the necessary requirements for withdrawing GBP? Additionally, it's worth checking if there are any known issues or maintenance periods affecting the exchange that could be causing the delay. If you're still unable to withdraw, I recommend reaching out to Coinbase's customer support team for further assistance.