Today was the day I have been waiting for for nearly a year now, I was patiently waiting so long as all labour and materials were supplied for free from one of our electricians so I wasn't going to push the guy.
We didn't quite finish today but in essence, we took the main tails that come into the house, split them before they reach the house consumer unit and give my hifi room (detached double garage) it's own switch then 10mm armoured cable running under the garden into the hifi room into a dedicated consumer unit. Here are a couple of quick pictures, I'll post more when the work is complete later this week.