Nothing wrong with going to PC World and having a good look at what's available. I've had good service from them in the past.
At least you will get to pick them up, test the keyboard and see the screen quality. If you see one you like check the price online and see if you can get it cheaper elsewhere.
Your needs are modest and you don't need an expensive laptop so stick to your guns. Just make sure the hard drive is big enough, at least 256GB, preferably more, and the battery life is decent if that is important to you.
Think about buying refurbished, Buenchico recommends an eBay seller.