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One other thing to mention. While the shower was runnng the boiler was making a banging noise. It's the first time this has happened. Do you think this has any relevance or makes things clearer to the initial problem of the burner cutting out? Thanks.

I know, it's a joke. I probably haven't done anything apart from the things I mentioned in my first post. I suppose intermittent is the word I need to explain the fact it is a little bit better. (As in, the water stays hotter for longer). I think I'll go with Agile's suggestion and have a look...

When you say "system corroding", do you mean the central heating system or the actual combi boilier. Some of my rads are very old, but the combi is relatively new. (4 years old). How would I go about checking the pump. Do you think that the pump is overheating and cutting out and hence burner...

The black needle and the red needle are both set at 1.5bar. I thought the red needle is adjustable and just an indication needle? Is that true?

When I say constant, I mean I havn't had to top the system up at all, so it's not losing pressure.

Thanks for the sharp response guys. The pressure is set at 1.5bar and seems pretty constant. My house is mixed with old and new radiators and I know the old radiators are a bit sludgy (and probably need changing). The combi system is around 4 years old. I think my next step is to bleed all...

Can anyone help me? I hope so. My situation is this. I have a Worcester 24i Combi Boiler that has been playing up recently. The HW & CH is currently working intermittently. The boiler fires up when a hot tap is turned on or the CH is turned on, but around 3-4 minutes later the boiler turns...