Dockhead, here in the US when we hear "England" and "electrics" in the same breath, we tend to think "Lucas, the King of Darkness!".
Hopefully your 33L guys do a better job than Lucas did on the sports cars? <G>
Lanor rates are all over the place in the US, the problem with contractors in general and marine
contractors even more so, is finding ones who are honest, competent, and actually willing to show up to do the job. A $50/hr electrician and a $125 electrician may be complete equals, the trick is to find a good one at any price
Escape Plan, you may find a pro will want to do the entire job himself, not unreasonable since that way he can warranty the entire job, but sometimes a bit expensive. It never hurts to ask "What would you be willing to let me do/supply, in order to keep down the overall costs?" And, to give him a precise written list of what you want done, up front. Adding a circuit or two may mean changing a whole panel or buying
a whole extra spool of wire--so planning ahead and giving him a clena start would be Job Number One.