I'm saddened to hear of your problems with the new house, unfortnately it seems to be fairly common these days.
RF's picture is what you have which in fortunate as the work you require is just fitting the extra bits [changing 2 gang switch to 3 gang, cable & light fitting] in the red box below. Technically a very simple job, it's the matter of the best way to manage the damage to the fabric of the room.
Your picture of the second switch does have an odd number of wires as it's a 2 way system [2 switches controlling one light] and the grey isn't in with the blue wires, it's in the '2 way' terminal.
EDIT: Looking at the second pic again You could be correct about grey being neutral, is this a bathroom light with fan or something similar?
RF's picture is what you have which in fortunate as the work you require is just fitting the extra bits [changing 2 gang switch to 3 gang, cable & light fitting] in the red box below. Technically a very simple job, it's the matter of the best way to manage the damage to the fabric of the room.
Your picture of the second switch does have an odd number of wires as it's a 2 way system [2 switches controlling one light] and the grey isn't in with the blue wires, it's in the '2 way' terminal.
EDIT: Looking at the second pic again You could be correct about grey being neutral, is this a bathroom light with fan or something similar?
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