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Could be your expansion vessel diaphragm has gone - A quick check is to tap it & see if it is empty or full.
NotThamesWater-
One would think the previous folks would have checked that. I need a service anyway.
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If its an Unvented HW tank which by the way it wrote it is, its not just as simple as recharging it you need to do it a certain way and they are dangerous so not something to fuck about with if you dont really know what your doing.
stevo_com
konastab01
Need a recommendation for a boiler and unvented HW system service in South London. Any plumber I've had before has not been able to stop the HW from dripping through the tundish every time it's running.