I am in Stroud Gloucestershire so not to far from Chris witor.
Try Chris Rabbets, he is in Stroud, Roadspeed 78 Wallbridge, Stroud GL5 3JQ 01453 750864
Register member and owns a Mk2 PI. Has worked on PIs for many years
I have three of these, one beyond repair in bits, one in the car that occasionally works and another inoperative (from memory). Would you like to have a go at making one (or two) out of these if i send them all to you to see if you can get one to work. Happy to pay costs. PM me if interested.
I have dismantled the Smiths ones. It all comes apart pretty easily by removing the bezel. These are my prefered clocks, and they seem to work a lot longer than the Kienzle ones. No idea about the inside really, but they go clonk and that winds it. It then appears to be a mechanical clockwork mechan...
These tyres are pretty good. I mount them with the white wall on the inside to give the correct look. They are not directional tyres. Shop around for the best price.
The switch is on the hinge assembly just visable peering through the white plastic cover. Unscrew the cover (carefully, they become quite brittle) and the switch is obvious. Same switch as the door switches. My guess it has been knocked out of its position.
Dave Harvey occasionally gets on here, but is always on the dreaded Facebook. IF you do FB, maybe give him a PM, or see if you have a close friend or neighbour that can do so on your behalf. He will know what to do, it could be carry on and it unsticks! Here's hoping!