Faster Payment Service?

On Saturday I transferred a significant amount of money from my Revolut card back to my bank account.
The bank is a UK highstreet bank and obviously uses the Faster Payment Service.

It’s now Monday and the money still hasn’t arrived in my bank account.

According to the FPS website it should take no longer that 2 hours if both parties are part of the FPS scheme. (Which Revolut say they are, and my bank definitely is)

All the account information is correct…So what now?