We’ve all been there. You plan a family barbecue for what promises to be a lovely Summer evening. The invites go out to family and friends, you hit the supermarket to stock up on meat, salads and vino. Everyone turns up…and then the heavens open. Cue everyone grabbing the food and rushing off into the house. Evening spoiled. The British weather is unpredictable at best, downright shocking at worst. It means that making the best use of your garden, and getting the most from it difficult and frustrating. What makes matters worse is that it is often warm , even stuffy, despite the fact that the rain is coming down,…