The sleeping bags look good - and v good value. Halfords have good value camping stuff, but not sure when they start to sell it. But Wildday are good, anyway.
I like our slightly up market airbed - it's a coleman one, a double mattress, but two separate cpmpartments, so you don't dip towards DP.
Take your own kitchen pans - saucepan, bigger pan and frying pan - but you might like to get a camping kettle.
You need a two ring camping cooker - get one with a grill if you like - BUT I think that on the more basic models, you can't use the rings and grill simultaneously. You need a 'regulator' which may or may not come with the cooker, and a gas canister...check your nearest suppliers - they are not those little tiny ones you use for primus stoves.
Take a plastic washing up bowl, and a container for water.
Do you want folding chairs and a table? We have chairs, but have managed without a table. The chairs with the drink holder in the arm are good, as cups tip over on rough ground.
Take a bucket for weeing in in the night! You don't always want to be traipsing to the toilet block esp if it is raining.