Just a couple of things that i didnt see anyone else mention, (may be out of date because it is a while since i have done this!)
On London Information they will want to know when you leave the coast of England, so get your call "G-cd coasting out" (assuming you are already talking to them)
and they will probably respond with a change of frequency at mid channel to either Lille ot Le Touquet.
When talking to Le Touquet they will probably ask you to report at Cap Gris Nez (Cape Grey Nose), have a look in advance at the map to work out where this is so you can report when you are there and also it wont surprise you when they ask as they hate repeating this many times till it gets through! There is also Cap Blanc Nez (White Nose) but this is north of Calais so you probably wont be anywhere near that.
Be aware that the weather can change as quickly as it takes to walk through the terminal, we once were in lovely bright sunshine walking into the terminal and after just enough time to do formalities walked out into thick fog! We ended up getting a "SVFR" (!) clearence out in the minutes before they closed as they wanted us gone! 100' later and it was the same bright sunshine and clear all the way home!
Apart from that enjoy, and in the future look forward to getting further afield such as Deauville, or up to Ostende (great for a weekend). Overall once you have made it into France it becomes a lot more relaxing and easy flying but France is a big place and 4.5hr flights can be a bit boring!! :-)