Any recommendations on who to go to and how much they should charge, I know I could probably do it myself but I want it done so no wires are showing and all looks good.

Looking around London area.

www.talkaudio.co.uk get on there

look up vd (dave he runs www.directice.co.uk)

he does mobile fitting as well

he built and supplied mine and alot of other proper installs :)

tell him martin sent you if you want more info number etc give me a pm :)

What sort of price would I be looking for that?

depends what you want

Right now I'm only looking at fitting a sub/amp wiring kit