<<I would have thought most radar units would have this, surely? Definitely very handy when advising D&D of a position.>>
I've never seen it in a lifetime in ATC (unless my knackered memory is playing up!). Is it available on the NATS TC and AC radars? On the occasions when I needed to liaise with D&D I used simple information like a radar handover, e.g. "3 miles south of Woodley"