bogwood in the UK

Does anyone know any good places to get bogwood from in the uk. I'm not
really interested in the common lumps of wood you see in aquatics shops
as these invariably are hard to aquascape with, I'm looking for
something very branchy or root-like like the wood amano uses in his
aquascapes. I find trying to get hold of decent, interesting pieces of
bogwood really difficult. Maybe there is some beach somewhere full of it?

Cheers,

Neil