Originally Posted by chris330D
I work for a utility company so I am biased. Most comparison sites taka a fee to pass on your details but I think it is flat for all providers. The devil is in the detail you supply as depending on the deal you may be better off with a low standing charge and higher per unit charge or the opposite. Also most suppliers charge a higher rate for your first x units then a lower rate. It is best to get hold of your old bills and work out what your demand was over a good period e.g. 12 months and then plug this in rather than let the website approximate. Hope this helps.
Thanks Chris (and others for all their comments). It's looking like quite a spread of providers being used and I'm sure we've all got our good and bad stories. I've got 2 years worth of bills, the last year being more accurate (due to the underpayment cock-up), which I've used to try to get the comparisons as close as possible. Will probably have another look at this tomorrow when I'll have a little more time.