Parts ordered. Thermostat in Housing, Thermostat O-Ring, Elbow Pipe and Straight Pipe. £55 delivered. Hopefully have them early next week. I'm definitely going to have to carefully number / name (where I can identify them!) and photograph all the connections. Still can't believe how many there are! Really hope I don't coc* it up!
The one thing that's worrying me the most is when I watched the step-by-step video by British Atlantic, there is a bolt at the back bottom part of the engine. The guy on the video uses a special grabber type tool to place it in then finishes it with a long bar adaptor. I don't have one of those so hope I can get in there and not drop the bolt!