The well known 'Labyrinth Seal' on the Gem. As my SMR used to say, 'if it ain't leaking it's empty boss'. I seem to remember they even welded a flange with a small hole the right diameter for a wire coat hangar onto the bottom of the exhaust!
As a kid growing up in Tardebigge, between Redditch and Bromsgrove, my mate and I often used to cycle over to the Hewel Lane bridge to watch the bankers shoving the trains up the incline! Ahhhhh..... the memories come flooding back!
