Fortunately no-one grabbed it, but it was a good domain, and coincidentally so was the other one I had problems registering.
I've just had a support message saying they've credited my account, but I've just logged in and it says £0.
They've also just sent me an email:
The DOMAINS you were interested in are STILL AVAILABLE!
Get them NOW before it's too late!
We noticed that during your visit on 2012-01-16 you put the below domain(s) into your basket but were unable to complete your purchase.......johnsrugby123.co.uk
I've never even heard of that domain.
As I say, 123reg seem to be going into meltdown.