I don't really get that.
For a start, for what it's worth, my 'modern electronic (3-phase) meter' certainly does not offer such a facility.
It may depend on how the meter is set up. The one at church can (from memory) cycle through three readings - two registers and a total.
More to the point, I don't really understand how it would work, unless it were effectively three separate single-phase meters in the same box
That's exactly what they are - or at least some of them are. Measure the current and phase angle for each of three lines, then you can do the maths to derive a total consumption and power factor regardless of whether it's 3 phase or single phases fed into it.[/QUOTE]
And this is the isolator just fitted to the smart meter when that was installed
Curious isn't it. There's clearly different policies in place - and not just across different DNOs. In our rental properties, there are isolators with one pole marked "do not connect" and a separate henley for the neutral. While in our house and at church, both line and neutral are switched. Both in the same DNO area, but I guess this is a meter operator thing rather than a DNO thing.
And if you're thinking that backboard shows signs of water damage, you're correct. From an early age we were taught that electricity and water don't mix - yet we insist these days on putting unsuitable electrical equipment outside, protected only by a flimsy plastic box that often ends up with the door flapping about.
Which shows another problem. An electrician that looked for CU upgrade wants to fit a new backboard.
Well he can't
It's not his board to be fitting a CU on anyway, so if the DNO and meter operator are both happy with what's there, it's not for the electrician to be changing it.