The legend is that if it rains on July 15, the UK is in for 40 days and nights of wet weather. Just in case it’s true, here’s a list of some essentials you might need: 1. The LED umbrella This brolly looks rather sci-fi movie, but is also practical. It’s on sale at 7dayshop.com now, click here to read more. 2. Waterproof suit Does what it says – ideal for 40 days of rain. Available at a low price, click…