|a 7" screen is too small to work with, IMO. 10.1 are not that great.|
I didn't do the money conversion but it seems like the price is nothing special. Why not buy new from a reputable store and get a warranty. I don't know how netbooks are configured in the UK but new models in the US ard being shipped with Windows 7 starter edition. Look at the link below to get an idea of what is available here.
Keep in mind that netbooks do not have an optical drive. Only point of access are the USB ports.
I suggest you try typing on a netbook before buying one. Go to a local store and try one out. If you already have a notebook I suggest you just use it. Netbooks will be noticeably slower.
One other item to note, netbooks may not come with any practical means of making a restore set of disks. You may need to buy them, unlike a laptop.