Hahahhahahahahahhahahahahahah. First interaction with Starling and their response is: use a different bank account.
Unfortunately, the relevant team isn’t able to get in touch with the merchant to have their bank sort code information updated.
In this case, it’s the merchants responsibility to ensure the details they hold regarding account numbers and sort codes are up to date, and as we can confirm that this is not an issue which was caused by Starling, we’re unable to resolve it.
You would need to attempt to have the merchant resolve this, or to use a different bank account to set this up unfortunately.