SIR - I really don't understand why the energy companies send people round knocking on the door to try to persuade you to change from one to the other.

I really can't see the point of this.

They all seem to follow each other and when you look at the figures there's very little difference in them.

So, they could save money by stopping these door knockers, who at times are a nuisance.

Ofgen, who are supposed to regulate and look after the customers, appear to do nothing.

So that's another lot you could get rid of and save money because I think they are absolutely useless.

JOHN SHEARON, Worcester.