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I would like to purchase two UK subdomains, but wanted to triple check with the knowledgeable people who stop by here first to see what the opinions are.
Cheers in advance!
Even if you put content on your UK sub-domain you'll still not qualify as a British site.
Full domain or hosting location are still the best way to ensure Google gets your country targeting right (it's one of the areas where, I think, there's a lot more work to be done).
I should point out that you shouldn't have to purchase sub-domains. You have the domain and you can make as many sub-domains as you like. Many web hosts, though, charge you for the admin costs of making the changes.
Yahoo does not like to see too many sub-domains being used. Make sure your site is large enough to begin to use sub-domains if you want to play safe.
I wouldn't keyword stuff in sub-domains either, though a keyword rich sub-domain does help.