NOW HERE IS THE CORRECT ANSWER AFTER ALL THE DRIVEL
Regulation, regulation, regulation......
Both ICAO Annex 14 and CAP 168 require aiming point and touchdown zone markings for certain classifications of runways. It's a certification / licensing requirement.
In the UK, MOD aerodromes are not subject to ICAO/ CAA oversight and hence signals, signs and markings are as per the relevant JSP.
This may change in the future due to European Harmonisation (don't worry chaps you'll hardly feel it) but the EU have yet to decide.
Sur le incontinence, many Mil aerodromes share a civil side so Annex 14 applies.
There is a distance relationship between the ILS GP, PAPI origin and the runway markings, so even though it may work at a subliminal level they all help. Or have not yet been shown to be an hinderance
Sir George Cayley