Legally, and its worth checking the order for the road closure for confirmation of this, they can't do that.
Access has to be maintained for residents, at all times normally in any road closure.
And, if they try using the old one of a spark could cause an explosion, ask them why they don't just isolate the supply first.
My local council really like me, when I start asking questions about road closure orders.
Anyway, get out and take a few pictures of those signs. There's a thread in General Cycling for strange road signs. You might be able to add to it.
Legally and everywhere on the internet including council's website the dates are 24 July 2024 to 30 August 2024. I checked everywhere myself as it's no fun having nowhere to park a car.
Those paper signs weren't here at 18.10 yesterday when my landlord comes back from work. But they were here at 6 am today. Looks like somebody stick them as late as possible to avoid any upset residents.
As I mentioned gas works company is notorious about not giving a hoot about anything.
Just have been outside and had a chat with a neighbour. Apparently he does something related to roadworks for a living and knows a bit about rules etc. He said SGN can't simply take over the whole street. We then both decided that we will see.
Street has got only one "Road closed" sign next to our house. That's it. No machinery, no barriers, no workers - nothing. Neighbour was surprised too.
Street isn't empty from cars. There are still loads of residents cars parked.
Oh and I will be taking a photo of the street each day. Out of curiosity.