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disconect filling hose altogether valve may be fully closed but it can still let by water if faulty,hose should not be connected when not filling.

£90.00 is a fair price for changeing gas valve. still most prob thermocouple loose or pilot not playing on thermocouple correctley.

sounds like your filling loop valve was letting by water thus increasing the pressure.dont leave loop conected after filling. it is common after using pressure relief to drain system for it to leak due to muck getting stuck on the seating,try filling and releaseing water from pressure release...