SB,
Unfortunately a flight plan is not tantamount to PPR, a phone call is required to enable the pilot to be breifed on the latest information and routings to be expected, as a number of visiting PPL's (UK especially) appear completely ignorant of the rules and regulations of flying into class A airspace.
What the Jersey authotities are trying to resolve is the mass arrival of light aircraft at the same time as commercial aircraft, the plan mooted is to apply some sort of slot time arrangement to give the ATCO's some breathing space. This has been suggested by the Ops staff at Jersey and not the ATCO's, I cannot see this working as it would involve inbounds to Alderney and Guernsey as well and the Guernsey authorities will not agree to Jersey controlling the rate of their traffic!!
Also a number of pilots assume wrongly that the Channel Islands are part of the EU and the customs regulations don't apply, unfortunately they do and you cannot fly to and from anywhere in the EU without clearing customs/immigratation and in the case of the UK Special Branch as well.