It's exponential Dave, you need one twice the size.
What? The workshop or the G&T? I thought about a third G&T but decided that would look bad.....so I bought a bottle of chilled Rose while I was in the shop for our dinner!
Incidentally, what do folk favour to eat in this hot weather? I was planning a lasagne but I ended up making tomato, mozzarella and basil sandwiches on toasted ciabatta bread. It's just too damned hot to stand over a hob.The chilled rosie went down a treat.
DaveM