Enter your IBAN, e.g. GB07NWBK56000312345679
Click Validate.
Copy over the BIC, e.g. NWBKGB2L
And the Sort/Branch/Bank code, e.g. 560003
And the account number, e.g. 12345679
If you need more information, you can check out these topics:
Convert IBAN to BIC, Sort code and Account numbers
Converting IBANs to UK Sort code and Account number
Written by Support