Please value these domains.. amazoncodes.co.uk (This one has made profits of ££££ in a year - especially before christmas time!) lastminutehongkong.com silverlightwebdesign.co.uk (Silverlight as in the Microsoft language) Thanks
Don't register domains with trademarks in them. It makes the domains worthless and can get you sued. Don't reference MSFT with your 3rd domain, and drop the Amazon one ASAP.
I would go around to online hotel /flight booking companies and see if they are interested in lastminutehongkong.com. A bit long, but very catchy nevertheless. Could fetch mid $xxx if you find a potential buyer.