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[omega3000]

Well i can just about get in the bath but cant get back out so dont use it 

[llewellyn237]

The boiler has a limited maximum heat output therefore the temperature rise of the water flowing through it depends on the flow rate of the water. If the water flows fast the boiler will only increase its' temperature by a few degrees. If it flows slowly it will increase it more significantly.

Also, bear in mind that combo boilers also often have a small volume of water retained at a high temperature to reduce the delay, so when filling a sink this comes into play. You won't notice the limited heat output until filling something more capacious like a bath.

Also, ask yourself why you needed to reduce pressure in the system? It it was previously over-filled then fine. If the pressure is increasing on its' own then it indicates a leak through either the filling loop or from the secondary to the primary side of the combi heat exchanger.

It's simple really, when you think about it. But still, one of those easy when you know things.

[Shackeng]

Agreed, flow dependent  would say.

Your averga kitchen tap has a smaller feed and bore, this restricts the flow and hence the temp goes up. Bath taps on the other hand are a larger bore and hence flow more.

As for DIY.COM , its fine if you want half the UK's plumbers saying 'call a plumber', 'dont touch gas' etc 

I haven't tried them, but have had much help on Diynot.com over the past 10 years, in particular relating to boilers.