Jag's gone, and irrevocably so. But that's no reason why babies should be thrown out with bathwater.
I've spoken to operators, and the combination of HMS/IDM seems to have been an extremely effective means of getting 'eyes on target' more rapidly than is possible with other (non HMS, non IDM) platforms. If so, with today's emphasis on CAS, shouldn't we be pushing for HMS on the GR4 and GR9? And even for an interim HMS on Typhoon?
It would obviously be interesting to hear a FAC's perspective.
The key to my question lay in the words IDM and HMS, and not in the word Jaguar (which is an irrelevance).
It does, however, lead me to wonder which other platforms have a similar capability, whether, for example, the USAF's Goldstrike F-16s got a helmet as well as IDM?