I forgot all about my fun with isolator switches.
I had my SMETS1 smart meter installed about 10 years ago, but nothing was hinted about isolator switches - I don't think they were in fashion at the time.
Anyway I had to have the electrics checked in the house a couple of years later and the electrician said they can't touch the fusebox etc until an isolator switch is installed. By this time I was with the joke of a company known as Iresa and I arranged for them to install an isolator switch at my own cost, to be paid upon completion of the work. I think Iresa went bust just as after I'd left them, but either way they never got around to adding the £60 installation charge to my bill. I did chase it up with the next supplier, but they said although their were notes on my account about the installation charge, no charges had been added to my account and to wait and see what happens with the administrators. I think I even got through to Iresa during the administration phase too, but I'm still waiting to be charged. I'm just letting sleeping dogs lie now.
Fast forward another 2-3 years, EDF installed a SMETS2 smart meter and laughed when I told them about my saga and that they could have installed one for free at that time. Oh well.