were away from the house now, with the whole thing and a 10 week old we've decided to shift out as it's getting a little over complicated to deal with. So I can do my best to describe but no pictures.
a. to the right of the white MEM box; is a standard 100 am electrical board fuse, one with the "do not touch ownership of welsh electric board, criminal offence" hazard on it.
b. what is behind the lowered lid of the left hand Wylex CU; nothing but wall, as far as I know. Just the feed from the MEM switch into the CUs
c. the routes of the green/yellow conductors and any bare metal terminals they connect to; yes, there's a metal "terminal" rail style thing with about 10 holes and 10 grub screws that then connect to the earth cable that goes out to the new earth rod outside.
d. the routes of the thick grey conductors... by conductors I guess you mean wires? They come in through the wall, into aforementioned 100a welsh board fuse, into the Meter, into MEM Swicth in to CUs
e. the clamp for the water bond. : there are technically 2, on under the sink attached to mains pipe (install during electrical safety test) and one I attached to the piping in the old immersion cupboard this weekend. Though it still tripped before I did that. Both are silvery metal screw clamps.
f. your intake and meter. : The big grey box in the picture is the meter.. the "intake" in gather you mean the mains cable into the property. Comes from next door under guttering round house and in via hole in the door frame in kitchen.
Top left in the white conduit - are they thick round grey conductors or thinner flat ones? That conduit contains all 3 core 2.5mm wires.
Will post pics as soon as I can!