the grey ones are the neutrals from the old light switching cables.
the wire next to the cut blue is gn/ye.
i think i can tell you why they didnt open the screw on this one: because they cut it hot, and didnt want no sparking in the connector.
As said, Choc blocks are -never-used in j-boxes here.
how do you use them for i.e. 3 wires? all 3 at one side, and double fixed? or 2 at one side, 1 at the other?
