Join the camping and caravanning club.  It doesn't cost a fortune and you save the cost of the subscription in the first week if you stay on a club site every night.  They have fabulous sites with good facilities and there will generally be somewhere to plug in your straighteners.  To be on the safe side though you can buy an electric hook up for around £40 - £50 which will give you a couple of electric sockets.  When we bought ours many years ago they were around double that but worth every penny.  
In the midlands we stayed on a good C&C site just outside Kidderminster - I think it was called Wolverley the only drawback to it is that the ground is like a rock and getting tent pegs in takes some doing.
Dawn