I posted a B&Q deal yesterday for a Stanley waterproof toolbox and someone commented they had bought it cheaper at Focus last week. I went to check this out and couldn't actually find the same product (which means if you want a waterproof toolbox the B&Q deal is still pretty good :-)
However, Focus do stock the splashproof "Professional" series, and when I checked the price at the till I was rather pleasantly surprised to be told £10..... Since this is £30+ in most other stores I bit their hand off(!) I think it was £29.99 on the shelf ticket.
Doesn't seem to be on their website, but specs (from another site) are -
Stanley 192258 26 Inch Professional Toolbox
Extra large capacity toolbox with removeable tote tray. Suitable for the storage of large size tools and accessories.
Features a full length fold down handle and steel fastening latches. Splash proof, preventing rain or water entering.
Product Model: STA192258