The J2 and the RVT shared the same chassis and working parts. The cry was "Keep stirring - you'll find one in a minute!".
When I did QRA at Waddington in the sixties, the crews arrived from their luxurious accommodations in the Operations Building in standard crew buses driven by WRAF drivers. We would dash out from the ground crew's "Gypsy Caravan" encampment [AKA "Midgeley's Marauders"] and arrive at the aircraft slightly before them.