Ding ding round 2 of Hankchief vs studded tyres.
So having the shame of pedestrianising to work having left the bike where the tyre went kaput, I got home, got the roof rack out of the garage, put it on the car, drove to Murrayfield to pick up the bike, returned home, took off the roof rack and went into battle again with the studded tyres.
I got the defunked tube out easily and saw that some of the wire beading was exposed and sticking into the tyre, so I chopped the wire off and put a piece of polystyrene onto the end and put in a new tube. I don't know how, but the tyre went back on very easily ( maybe linked to the exposed beading). So far so good.
Pumped it up and stood back to admire my handiwork... BANG goes the inner tube. Arghhh. So out with another tube and repeat the process - Fortunately I still had the knack and it went on painlessly.
I'm guessing that the bike had learned its lesson. If it doesn't work it gets left behind on a cold and damp street corner - if it behaves I will leave it in a nice dry & warm(ish) garage or basement.