Does anyone have a solution to prevent water butts overflowing?
Thank you for all of your answers, lots to think about.
Robmar, the diverters I have are similar, though not the same, as those on the B&Q website.
Steephill and Palustris, I shall have a closer look at the levels and make sure that the connecting pipes are as near horizontal as possible, currently they are sloping down slightly toward the butt. I have four waterbutts and they were here when we moved into this house. The one on the patio must have been leaking for some time as there is a lot of green slimy stuff below and around the stand.
Fire, I haven’t received your message, I don’t know where to look for it.
Nick615 and Wild Edges, I live in Devon where it has been raining almost constantly over the past few weeks and I don't think that opening the taps to a trickle will be the answer but thanks for the thought.