It amazes me that some supposed business people still don't get it regarding domain names!
Are you seriously telling me that you can't see the benefits of abc.co.uk over say abacusbusinesscomputers.co.uk or why WebHosting.co.uk recently went for half a million dollars rather than the £10 or so you can pay for a previously unregistered domain?
Believe me I get it about domain names. but there is also reality.
In 90% of cases people will still only arrive at your website via a search engine, or by a link in their favourites, or via a link posted else where Very few people actually type in the domain name directly in the address bar.
It is all about branding, so when you're starting out on with a new website or a venture and your company name is abc plumbers, you might think that getting a domain name of abc.co.uk, would be a winner, but the reality of the situation is that abc.co.uk is probably the worst domain you could get. You'll get a ton of traffic for abc shoes, abc ovens, abc gravestones, abc tyres and almost anything else abc related, and probably not a lot plumbing related enquiries. You'll also have a lot of trouble trying to come up with a conversion strategy of trying to convert people you are on a shoe shopping frame of mind into a plumbing frame of mind. So lashing big bucks on the abc.co.uk url, is worthless. However, if you took the time to think laterally about your url strategy,
possibly goodqualityplumbers.co.uk, westlondonplumbers.co.uk, cheapplumbing.co.uk , emergencyplumbers.co.uk would probably be a better investment in time but the reality of the situtation is most people will still be searching in the address bar rather than typing in the url.
Interesting you chose webhosting.co.uk as an example, that site is nothing but a "affiliate referal site" so essentially the only way they can think of to make money, is by having affiliate referal links. They can't actually sell hosting. The Alexa profile of the URL, doesn't exude confidence either.
http://www.alexa.com/siteinfo/webhosting.co.uk#
So the reality of the situation is that URL is of somewhat importance, but it is hardly worth the investment of £500K, only of you're an idiot. There is no possible way that you would get a return on that investment