The electrics don't looks too bad apart from that talexus meter.
Nothing he can do about that.
Presumably the NSH are supplied via that bank of 15A fuses.
The other CU has some non-RCD circuits in it, which can be problematic when rewiring.
And talking of rewiring, as you've you've got a fairly substantial refurbishment to do, now is the best time you'll ever have for any major electrical changes. Think hard about where to have sockets - it's difficult to have too many, and also about what circuits to have. The items on the list below won't all apply to you, but they are worth thinking about:
- Upstairs sockets
- Downstairs sockets (or a L/R or front/rear split)
- Kitchen sockets
- Circuit for appliances
- Cooker circuit
- Non-RCD circuit for F/F
- Non-RCD circuit for CH boiler
- Dedicated circuit for hifi
- Dedicated circuit for IT equipment
- Upstairs lights
- Downstairs lights
- Lighting circuits with switches in the usual places but with 2A/5A round pin sockets at low level.
- Immersion heater
- Loft lights
- Shower
- Bathroom circuit
- Alarms
- Supply for outside lights
- Supply for garden electrics
- Supply for shed/garage
Plus any peculiarities brought about by your house layout & construction - e.g. in mine because of solid floors and where the socket circuits run, I have a radial just for a socket in the hall, the doorbell and the porch lights.
RCBOs have come down in price to the point where it's quite realistic to use them throughout, but if not the CU should have at least 3 sections, 2 on RCDs and one not into which you can install a mix of RCBOs and MCBs.
It can be a good idea to put all wiring in conduit for ease of future changes. And if you specify metal conduit for switch drops, or BS 8436 cable it removes the need to have RCDs on lighting circuits (apart from bathrooms).
If you live somewhere where supplies are dodgy in the winter, have the lights, the boiler supply, and a socket in each room wired to a separate CU, or a separate section in a large one, that can be supplied by an emergency generator - lights, heating, TV and a kettle/microwave make life a lot more bearable.
Flood-wiring with
Cat 5e, Cat6 or Cat6a cable is worth thinking about. Do not listen to people who tell you that wireless is a perfectly good alternative to wired networks - it isn't.
