That Eco-nique "Hemp" cover looks really nice and cloth made out of hemp is very sturdy. As you pointed out, garygibsonsf, the reviewers on the UK Amazon site you linked - even the one that only gave the cover three stars - all seem to be very happy with their purchase, as is neonbible. The cover is being sold by the US Amazon site as well and all but one of the reviews on that site are also positive. I would go for it, if I were you.
I have an Oberon cover and really like it, but it is expensive, and I think I would be pretty happy with the Hemp cover, too. (Not that I have any plans to replace my Oberon cover - it is definitely a keeper.)
Holly