Interesting recent experience of one difference between an old-style fuse box and a new RCD-based consumer unit.
When our consortium bought the pub 5 miles from here, we had a rubbish BT broadband connection and no WiFi coverage to speak of, so as a temporary measure while we figured out how to wire it up properly, I installed a couple of TP-Link powerline kits and we replaced BT with Starlink. All worker just fine for a few months, despite the fact that the powerline devices were connected to at least two, possibly 3, separate ring mains. Then we had the main old-style fuse box ripped out and replaced with one fitted with RCBOs - individual breakers, each with its own residual current trip, for each circuit. Immediately the reliability of the powerline kit went through the floor, sometimes working at low speeds, sometimes failing if particular appliances such as the washing machine were running at the time. As all of our point of sale kit relies on the powerline kit to provide a data connection, the only solution was to install a proper hard wired Ethernet backbone net with WiFi access points.
Nothing to do with SQ of course, but could be of interest to anyone planning to use powerline kit to avoid having to lay Ethernet cables - if you have a modern consumer unit and you need the powerline kit to span multiple circuits it may give you problems.
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