Warning re: Region 0 disc on amazon.co.uk

I was looking up the Mondo Macabro DVD on amazon.co.uk and it is listed as being all regions. However if you look at the "other sellers" details a lot of them list the disc as being Region 1.

http://www.amazon.co.uk/Girl-Slaves-Morgana-Fay-DVD/dp/B000AA4F88/ref= sr_1_1?ie=UTF8&s=dvd&qid=1251377452&sr=1-1

You're an errand boy, sent by grocery clerks, to collect a bill