I dont think Steve will be upset,
not really going to make a living from it, .. i simply noticed that a few people were a little concerned about doing it themselves, ... so , with that in mind,
Decided to offer to fit them, with a very , very small profit margin...
Who would do it for free ,
If you knew me, you would know that i will help anybody out in any way totally , without asking for payment...
But i cant fit them all for nothing.... if i could ...i would.
gazza I can tell you are genuine and I am glad you are offering to help others for a very small cost, but trust me if you aren't qualified to do it and something goes wrong they will blame you even though you tell them to switch it off etc, I have no problems with the guys trying different things and bending a few rules but the minute you do it for someone else you are asking for trouble. but well done on the trying to help others anyway we need a bit more of that 
(edit)just read your reply and if you are happy to do it fair enough good luck
I totally understand where you are coming from Stu, and thank you,
Would be nice if we could all work through this early freeze, and i have seen how many of us are sat at home,
Its not profiteering, and thanks for making my point, and yours... which i totally understand,
but hey, guys if you want it fitted.. and you know your house electric mains are ok...( god its only an element)
Then i wil fit it.... with comebacks or anything.
Just willing to help and only cover the time it takes to do that, but no one needs to take up the offer, its only a thought..
but it works treat , looking forward to my hot water in the mornings all through the winter.