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Will it make my system more efficient if I set the cylinder temp higher than usual (say 70) and use a TMV for HW distribution; then set the boiler so that it doesnt fire for HW until the cylinder drops to 40? The cylinder has 50mm insulation, and I've read somewhere(!) that modern boilers...

We've bought a typical early 70's 4 bed house. It has GFCH, open vent 'Y' system with microbore which is under the solid floor at ground level. None of this works. The hot water doesn't get hot. I've spent some time with replacement pumps and a flushing system. Basically the boiler circuit...