Shackman,
i cocked up my reply. NOT should have read ONE.
True they were standardisers not trappers but old habits die hard and it is very dificult for the victim to determine the standardisation.
BTW I was a standardiser at one time on the RAFASupU. Yup we tired to train. Indeed one sqn actually wanted us to chop one of their navs. The nav duly cooperated by being singularly dim and operationally inept. We made an adverse comment but declined from being the choppers too.
IMHO we should have chopped him.