Thanks Webbo!It's not really the Christmas present that I wanted!But need a bit of occasional heat and hot water!Did you get your system flushed?Or put on a "filter?"
It not illegal to do DIY work on a gas boiler.It is illegal to take payment for work on gas if you are not gas safe registered.You can work on a gas system if you do not take payment but you must be a "competent person".
I was looking at Vaillant - 7yr warranty and not too pricey ( a good chunk less than a Worcester). I will not be getting another shoddy Ideal Isar!!!