Yes, those welsh boys may get homesick, they take their own sheep and if hungry it may end up on the barbie.
Seriously though, a electric kettle and the means to connect it into the campsite hook ups, whole lot quicker and convienient than gas. Also very important a few tins of all day breakfasts or cassoulet. You may find there will be some time when you are really pleased you took them. One night we arrived at a campsite after the cafe had closed and we were VERY gratefull to those who had taken some tins and chose to share with us. One other thing you may find useful is a mains powered flourescent lamp. Team Shortwayround had one last year and it was very good. But no doubt you will find as we did that you will muck in together and between all of you you will find all you need.
As Tom said donīt forget to take a sense of humour .
My wife has this written of the back of her Disco
"Donīt let your fears stand in the way of you dreams" I wish I had thought of it, just go out there and have a good time, Iīm sure you will