This ATX case, which costs around £50 normally is currently less than £20 from PC World. It can be collected from store or delivered. However, I can't find any stock near Bristol or London. But apparently you can pop in store and ask whether they can send it to that store. But I don't know for sure.
It's a really good case from a good manufacturer. It's equipped with fans in front and back with filters on them. There are side vent on the side panel on top of the processor and the expansion card for extra cooling with filters as well. Really good for keeping dust away. I recommend it for its current low price. Was thinking of getting it myself but can't find one nearby and I need it urgently, so can't wait for delivery.
Hope this help anybody looking to build a new PC.