Low pressure in Glow Worm Combi?

sounds like the heat exchanger inside the boiler has gone and the pressure from your heating system is getting into your hot water system which is why there is no sign of any leaks. The only way to prove this for definate is to cut your central heating off from your boiler and loop the pipes together thus eliminating any underfloor leaks etc , pressure it up and see if it still looses pressure.

Steve
June 2005