Well I couldn't wait any longer. The new kitchen isn't quite finished, the floor and wall tiles are not down yet and not all the fixtures are in but the work surfaces are in and the oven and hob are wired up and plumbed in.
I decided I had to give Paul Kribbs' dolly a go and make a pie.
I had no real snags, Paul's suggestion that temperature is the issue when removing the dolly seems to be right.
The only thing I did differently was that, after pushing the dolly into the pastry (made exactly to the recipe already posted) to form the base, I then flipped the dolly and pastry over and worked it downwards rather than trying to raise it up. I found it much easier as I was not working against gravity. I also made sure there was plenty of flour between the dolly and the pastry and did not grease the dolly first. I then popped it in the chiller (still upside down on the dolly) for 10 minutes while I mixed the filling.
When I took it out the dolly came out without any problems, probably due to the excess flour and maybe not greasing the dolly (which I thought would set and cause it to stick).
I tapped out the excess flour and filled the pie with the mixture, popped the lid on. I didn't have any eggs so just brushed with a bit of milk (egg definately would have been better) and put it in the oven for the times Paul used.
It oozed a bit but looks great and tastes fantastic.
Pictures below: