A bit of an update on this thread.
I emailed western power distribution with a diagram of what I wanted doing. They quoted me £191.00, which I had to pay up front before they would even come out to take a look.
They came to do the job today.
Before:
After:
I wasnt at home, but they refused to reconnect the tails to the consumer units, leaving the house with no electric. Apparently this is 'normal' procedure, so they cant be sued. I can understand if the electrics are some kind of deathtrap, but it was all connected up and working before their visit and there was even a periodic inspection certificate present.
So I have had to reconnect CU2 when I got home from work.
In addition to this, they have put in a switch with only a single outlet, so I cant connect up both consumer units. I will have to get a Henly block at the weekend to allow me to power up both consumer units.
I am glad that the pay as you go meter is gone, but am a bit annoyed that they didn't leave the installation capable of powering up both consumer units (as I'd asked). Seems a bit poor for £191.00.