Been to look at a job today that we are doing, it the same one as my fire alarm post. Like a dick I forgot to take photos which would have made things a lot clearer but the job is 150 miles away and we had a day to spec it so we were rushing. 9 flats, 5 upstairs and 4 downstairs, it looks like the 4 bottom flats were re-wired a few years ago, red and black but plastic wylex RCD units so not that long ago, a mains upgrade and new socket fronts / LED lighting will be fine in those. However the consumer units have had new submains run to them in 16mm T&E, and a pound coin meter fitted, they have just bolted the T&E to the old 3 phase bus bar system like this. with a 60A SW/fuse inline in the communal cupboard. https://www.cef.co.uk/catalogue/products/46108-100a-1830mm-width-busbar-chamber We are removing the pound coin meters, so the only meter point is the DNO poly-phase incoming meter. The supply goes something like this - 3 phase head - meter - main isolator - 3 phase RCD - bus bar chamber and then to various submains and isolators for things like fire alarm and heating etc. I was going to rip the lot out and just put some Henley blocks after the meter to wire the 9 new flat isolators to plus a communal board, the T&E sub mains are in trunking so no need for any RCD protection on them. The upstairs flats are a total bodge and need totally redoing with new sub mains and total re-wires, does this sound the best approach with Henleys then tails into the SW/fuses, for the distribution. I know I could fit a Bemco type unit but there is a cost factor, the developer just thought he could change sockets and switches everywhere.