You seem to be completely missing my point. You said you wanted to get advice now, so you don't get stung later down the line. We know nothing about your supply, current wiring, house construction, layout or distances. Without seeing your house, it is impossible to advise on the best way for you to proceed.
The site is not pointless and my post was not following a standard 'get an electrician' route. If you plan to get an electrician to do the job, the time to engage him/her is now, at the design stage. If you plan to do it yourself, you should read up on BS7671 and electrical testing. However, I would strongly recommend the first option.
Please don't take offence to my post and feel free to ignore it.