Hmm, now sure about the domain names to be honest. Looking at them from a memorable point of view, these are not. What's wrong with www.lothianplumbingservices.co.uk, www.lothianheatingservices.co.uk or something (these are available)? Great for SEO (google and the likes), just not sure if there's a business with that name already registered (google doesn't show anything on the first page).
Don't just rush out and buy a domain name if you have no intention of getting a proper, well designed, site up and running. Nothing worse than viewing a site that's been thrown together in some freebie "web site builder" software. Give me a shout if you need any help with this side of things, this is my day job (mainly working on the likes of RBS, Channel 4, and lots of other 'high profile' companies), and I live just down the road from you
Cheers,
Neil.