cant believe the arrogance of some posters here. If an airfield is closed, its closed for good reason. If the requirement is for PPR, then why not do it Hardly difficult is it? Some airfields, Duxford for example, often have high performance aircraft carrying out display practice overhead, and the last thing i would want is somebody blundering through my sequence without an appreciation of what's happening in the circuit. Sadly something that is all too frequent these
I suspect you may be confusing a phone call for PPR, with calling up on the radio before landing.
PPR is PPR - if you have to do it then fair enough, but it's also reasonable to question the justification for it. I suspect it's for planning permission reasons in most cases (i.e. NIMBYs) and nothing to do with operations. Most airfields would like all the business they can possibly get; if you look at the runway/taxiway condition they could pretty obviously use the money.
Shoreham, incidentally, has a movements limit imposed by planning. Same as Farnborough, though the latter is a far lower figure.