In the dim and distant past
We operated into and out of RAF Northold, almost daily, (not Shell/ or NJE) and were offered practice PAR for controller training.
The game was afoot, our brief, from the SATCO, was to be good but not too good....(speed control ( lack of) being his request). The PAR was to 0/0. The controller asked out type, (wheels to radar blob distance). The controllers were all good, and placed us on the numbers every time.
We for our training, conducted SE.
In return we were able to sit in the Radar room drinking RAF issue tea and biscuits, watching the work load, and chat to the PAR guy.
Them were the days.
Also did one or two for real in RAF Little Rissington, in very bad WX, but both engines fully operational.
glf