'Bumbarrel' is an old name for the Long-tailed Tit, everyone's favourite garden bird. And the reason they're called that is for the shape of their nest. It's almost spherical, with a little hole at the front, and made from a special weave of moss, lichen, spiders' webs and feathers.
Had a brief look at Boot Pond in Bentley Priory, The toe end of the boot was bunded from the rest of the pond back in 2014, creating hopefully a fish free area of the pond. The pond is looking good and the bund has vegetated nicely.