For my Rothmans SP, I've got Classic Bike Insurance, fully comp, 1500 miles per year limit. £180. It costs a bit more than many other policies, but it has a 'guaranteed value' of £5000 if a total loss claim is made.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30