Longfinal wrote: In effect, if not in law, the airspace does become a restricted zone as you would be extremely foolish to fly through it without contacting the organisers or controlling agency. If someone flies through a NOTAM'ed DZ and comes into conflict or worse, the Authority won't be forgiving.
Actually I don't agree. I think that it's too easy to overreact to this sort of thing. Your duty as a pilot is to plan and execute your flight in such a manner that, as far as is reasonable in the circumstances, you are able to ensure the safety of your flight, passengers, third parties etc. There is no absolute prohibition of flying over or near parachuting or gliding or any other NOTAM'd activity (except of course a RA(T) or Temp CAS). But plainly flying recklessly through an active DZ or active gliding site such that you or others were endangered would very probably not
meet the standard of doing all that you reasonably could to ensure the safety of your flight.
Clearly if you did
fly over it in circumstances that were less clear-cut and that resulted in you having your collar felt then if your response was 'I hadn't bothered to check NOTAMs and so I didn't know it was there' you'd expect a clip round the ear. Rightly so. Likewise if you said 'I did know it was there but actually I couldn't care less'. In those circumstances no-one is likely to be very forgiving.
But if your response was 'I saw it was there and on the basis of my judgement I took appropriate action [whatever that might be] to maintain the safety of my flight taking account of this hazard' then, whilst some might still consider your actions (whatever they were) to be unwise and/or may consider that you as a pilot had demonstrated poor airmanship nonetheless in terms of prosecution it would actually be down to the Authority, if so minded, to prove to the satisfaction of a Court that you were negligent, reckless or stupid in what you did. It will all depend on the circumstances.