The credit didn't appear on the statement dated 28th August; I assumed it was too late for it to be included. It doesn't appear on the September statement either.
I've just spoken to the accounts department. Apparently, because I was abroad on the day it was applied it couldn't be credited. I'm told it will show up on the next statement.
Sounds like porkies to me...
Oh, and my BlueTooth headset has been ordered again.