I was quite happy with the UK BDs quality. Like all of Bakshis work, it's never going to look clean. Wizards, LOTR, and Fire & Ice all have a very similar rough look to them on Blu-ray. Though very film like, which is all I personally want.
I'll pick this new BD up sometime soon. I've had such a weird fascination with Bakshis work my whole life. It's not that they're great films, they just have a very unique quality to them that I can't quite put my finger on. Maybe it's nostalgia. Who knows. I'm not an art collector, but I happily bought a beautiful original production Cel of Necron 99 from the film a few years ago, direct from Bakshis family run website. As someone mentioned, the Bode inspired animation is just so interesting IMO.