Julian Cope presents Head Heritage

Nice list of big old barrows. Some of the bigger round barrows do have stone elements too in the mound mix, which aren't always obvious (especially the ones covered in gorse or bilberries). I guess The Gop is a cairn, properly.

The biggest one close to home for me is Emma's Grove, which at 12ft is pretty decent for these ploughed-down parts, but not in the same league as those in your list. https://www.themodernantiquarian.com/site/11656/emmas_grove.html