@Eri1, the account number and sort code can be validated. I don’t think it’s possible to send any money to an invalid account. Most likely the account details were validated before sending, or at least this what I would expect.
In case your bank sent the money without validating the account (unlikely), I would expect the transfer to fail and the money to return to your account. I have no idea how long this could take. You need to contact you bank to ask this.
In case the account was valid, the payment will be successful and you need to follow @henrikbjorn advice and solve this with your bank as there’s nothing can do about it, just like @Powie said.