If you're reffering to the UK Zombie Flesh Eaters [Blu-ray Steelbook], then it's Region B locked according to Hidefninja and Arrow Films own website. Check it out for yourself, but it looks to be locked.
Yes, most of their releases now are region B locked. They must region lock it, because that is what the licensors want. If they tried to release it region free, it would a breach of contract. Arrow themself said some stuff will region free, but most will be region B.