Just a small point: Make sure you don't depart BEFORE the time you have put on the Gen Dec. I witnessed a guy depart for Ireland 15 mins early, only to be called back by Special Branch once he was airborne!
The same is true of your return. Make sure that if you are back early you hang around until your intended arrival time just in case they show up!
Jersey really doesn't hold any fears. Just have an estimate for 50N ready when they ask for it, and beware of the base of N866 at FL35. Expect to be given a departure restriction of not above 1000ft VFR initially, but Jersey Zone are usually amenable to you requesting climb later subject to their traffic. 1000ft all the way to 50N in a single concentrates the mind somewhat. The waves look very close and you will have about 90 seconds to get ready if the donk quits!