Hi There
wimbledonhomes.co.uk - Fine for development, hard to sell though because estate agents etc aren't interested in this kind of name, leaving web developers as target market.
virtualcornwall.co.uk - This is a good name from a site development point of view, but again potential buyer would be a web developer and hard to sell the domain to them.
uarm.co.uk - Sounds like "You Arm", maybe a gaming angle here but it's not that obvious. Probably low value as difficult to sell.
rockmonsters.co.uk - Good brandable domain but again would probably have to sell to another web developer and they won't overpay. Nice name though. Could be marketed to radio stations or rock venues for a better price.
pcscreens.co.uk - Not really that valuable in my opinion. IT related but no strong branding.
networksoftware.co.uk - I like this but network software companies won't be that interested as they will just use their own brands. Great for a site discussing this niche though. Hard to sell the domain though.
airi.co.uk - It's an OK four letter as it has some brandability. Could take a long time to sell though.
I hope that helps.