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@Zach
Took me a while to find that tape measure. Having looked again it turned out the rear wheel was not on straight and so the chainline is not so bad (1mm out - front line wider).
A spacer sounds like a good option but would I have to file down the cotter pin to get the chainring on?
Hammer and block of wood sounds intriguing. Are you suggesting I just bash the edges of the chainring out so it becomes concave?
Thanks for the help.