Dont forget the Warning triangle, spare bulbs, and first aid kit that you need for the car - dont want to give the plod more excusess to have a go if you get pulled. Also I seem to remember and advice slip from the RAC saying it invalidates your insurance with out.
Anybody who belongs to CostCo, they are doing an RAC emegency kit with bulbs, triangle, High vis vest, torch, pliers, wheel brace, + loads of other stuff in a canvas bag for about £8 - bargin!