An uncle used to work for BL (he retired long before it became Rover as he started with Austin at Longbridge after WWII).
He gave me, maybe 35 years ago, a roll of the pinstriping tape they used at the factory on cars during late 60's / early 70's. It was real paint with adhesive on the back.
When applied you struggled to tell the difference between it and a painted on pinstripe.
I'm not suggesting it was ever used on Minors but just pointing out there used to be a quality pinstripe in a roll.
I've never seen it for sale anywhere though
BTW a mate, for his 21st, had a brand new JPS Capri off his parents. It was black with gold pinstripes that were constantly comming off and being repaired / replaced under warrantee. At least the stuff my uncle gave me only came if you attacked it with a chisel or sander !
Paul Humphries