I have replaced the stands under the water butts. It felt like a big job - I used chunky timber to be sure it could take the weight and the result looks very tidy and strong. We took some trouble to level it which should help support the weight of the water butts. The pipework connecting the guttering on both sides had come apart and may have been leaking for a while - the ground under the shed seems very wet. It's not a great photo, but it shows the frame and the new space carefully created to store the wheelbarrow and other such stuff.
The tomatoes are still producing fruit and the leeks just get better and better. We'll be working on the greenhouse extension before long.