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Maybe not because the hot tank is likely not on the same loop as there is a diverter valve somewhere which switches between the heating and hot water.
As above don’t mess with the expansion vessel, check when the mega flow was serviced as you may get all your questions answered with one plumber visit.
This is what I like about combi boilers as they are easy to work out what is what, Y and S systems are always like spaghetti.Disclaimer: I am not a trained plumber and you must seek advice from a professional
Mr_Smyth
Thanks. The only pipe going into he boiler that was cold to touch while the heating is on (and not labelled 'gas') was the one on the far right - so it'd be a valve on that one presumably? There's no valve on it, so it must be somewhere else in the house - would it being near the monolith make sense?