Many thanks for everyones messages of good luck to Jago.
He went in this morning, caused total mayhem as usual. Whilst I was filling out a load of paperwork in one of the surgeries, he managed to empty a box of it's contents and spread them over the floor.

The vet and I agreed it would be easier to put him in a cage first and then do the paperwork.
I was going to have to ring at 2pm to see how he was but got a call at midday (heart in my throat as I answered the phone with "vet" on the caller display) to ask if I could pick him up as he had got over the GA very quickly.
Apparently he was not making any noise but kept winding up two Dalmatians in there. Every time they stopped howling he would start them off again and then sit back and watch the fun. Disuptive influence comes to mind I think.
He's home now, none the worse for wear, voicing his need for food (been starved since 6pm Sunday) as only Clumbers can.
Just the wait for the results now
Steve