I asked the CAA Chart Editor at DAP (now looked after by NATS) to put military flow arrows on the CAA VFR charts. He said "it would make the chart too cluttered". I said "better a cluttered chart, than a cluttered countryside with aircraft parts following a mid air"; he didn't look amused at my serious if flippant comment!
As for HIRTAs, yes they are on civil charts, but the UK Low Fly Handbook details the susceptability of each military type to specific emissions - something you don't want to fall into enemy hands!
Out of interest, the HIRTAs on CAA/NATS charts are complete hoop - for instance the HIRTA around RAF Croughton is not the right size for your average Cessna 152. For that aircraft it is a lot smaller - it is for a full fly-by-wire aircraft or one with digital engine control. Think about it, if the intensity was as bad as depicted on the chart it would be frying the traffic daily on the A43 dual carriageway!! (even from the sidelobes!)
LJ