Thanks for the reply. We have the original badge die so are having the badges now made locally with the yellow in enamel. I don't know how many were originally made but found that some at least of the originals had the yellow in a glued on vinyl / plastic type material which over time, as several of our group has found , peels off .
I'm aware of the Ian Sedgwick car ( a four seater ?) which I believe you have restored .