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bite the bullet and go for a vaillent ecotec. My fitter travelled 350 miles to fit mine and knew he wouldn't have to return for problems. They are so good he gets no call outs on them, only servicing. The DHW is good too.

I agree with Stevies62 Pump up your expansion vessel to about one bar. But make sure there is no pressure in the boiler or you will get a wrong reading.

try turning your heating off. Let it get cold. Turn on the hot tap and see if the heating pipes get hot. If it does you have a sticky diverter valve : :)