On both of my visits to Lydd i never bothered with the dusty high viz shoved in the very back of the a/c... didn't even see the sign or get a telling off. The students of the flying school at lydd have to wear them tho
TBH i have never worn it...even southampton int. didnt say anything to me! A/c captains should be doing a constant lookout anyway......even when taxying.