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Cistern has started to fill up very , very slowly- water just squirting out of each side of refill valve as if leaking under pressure. Does round nut unscrew for replacement washer or valve?

Since full service 3 months ago boiler keeps firing up and heating whole house for anything from 10 mins to 1hour. W'ont turn off manually except by turning off at mains. All tappets on clock set to off and thermostat set to 0 but still comes on up to twice daily. Also water dripping slightly...