Not flown it rotary but many times fixed wing.
I dont know how high you like to go but i always route st catherines point direct to a point just east of ortac if ocas. If you look on the chart this keeps you to the east of the airway and west of the danger areas with the airspace forming almost a choke as you close on the jersey zone. You will get a service from bournemouth lars pretty much all the way until you pick up jersey just north of 50n. This is also about the shortest crossing. Jersey will either give you a direct to guernsey or first route you towards the cap and then west to guernsey. Expect quite low level but feel free to ask for higher and to route via alderney if you want some scenery. Jersey, guernsey and alderney are all pretty and interesting islands with good facilities at all three airports. Flying between the islands isnt an issue.