I have now had an informative reply from Rob. It would appear that, due to the plethora of commas, sub-para (5)(c) is open to ambiguity of interpretation. It's supposed to read that take-offs, landings, practice approaches and checking navaids or procedures at licensed or Government aerodromes only are exempted from the rule regarding 1000 gathered in the open! As are take-offs and landings at any other aerodrome in another country.
So, regrettably, we can't hold the first 1000 person open-air PPRuNe bash 999 metres from Gatwick on a busy holiday weekend......
The revised draft is supposed to protect the Great Unwashed at, say, a local agricultural show from someone in a private helicopter trying to land in the car park, it would seem. But if introduced as currently written, it could cause huge difficulties for those flying from an unlicensed strip everytime Fiona and Samantha hold a pony club show within 1 km - or if yet another thieves' paradise ('car boot sale') is set up in Farmer Giles' field just over the boundary fence........