Oldbuffer, your response is much appreciated. I will be uploading some photos shortly so maybe that could help.
It looks like it may have well to looked at by an engineer as it could be anything that you just mentioned.
Thanks.
I have a Heatrae Sadia Megaflo electric boiler which is producing no hot water. I have recently moved to the flat (3 months) and the bolier is out of warranty. I am very reluctant to call out an engineer and fork out £ amounts of money as it could it be something very simple.
I am not sure...