I've followed cops and been followed by cops more than few times (we were going the same way rather than for anything I'd done) and I've also pulled up next to several foot patrols to ask directions, etc. and not had problems with my long TORS. As Steve, above, says, it's more likely an unappreciative MOT tester that'll fail you for them. Refit the stockers, get the pass then swap them back.
