Don’t hold me to this but if yours is a GBP account then I believe the Sort Code needed is 30-80-12
If you click on IBAN there is a eight digit reference number at the top which will be your unique account number. To confirm that if you locate your first top up into your Revolt account by debit card tap on it then you should see in the top right corner of the pop up screen an icon looking like a document tap that it takes you to the PDF statements for your revolt account and looking carefully you will see an account number on the that statement which will match the eight digit reference number for the IBAN
Please correct me Revolt if I am wrong ! Otherwise hope that helps ?