The P2 is a new beast to me. I'd always known about them, but had only recently taken much interest,.It was funny, because only last night I was Googling Earl Marischal's deflectors, to find a clear shot; only to be faced with the excellent picture on the calendar this morning.
I never saw one. My early teens were spent through the 1960s north of Inverness, one of the areas on Highland routes to lose steam first. Thus, my experience of Gresleys was nil, despite my father being from Middlesbrough.
Regards, John