I imagine their MS Polymer should be good as I've yet to come across a bad one, though their stated coverage rate is at best over optimistic if not simply misleading. ALL of these adhesives use approx. 1-1.2kg per m2 dependent on the condition of the sub-floor and subject to the use of the correct trowel (6MM V-Notched - b11). Their PU Primer is exactly that and not to be confused with a DPM, even with two coats it only protects you up to 5% by volume but be aware that their literature that I have seen says 5% RH which is ludicrously low so I am assuming they meant 5% by volume!! YOu should get that clarified before even considering using it, and if it isn't a typo then question the knowledge of the person who put the info together in the first place and walk away! There are other MS Polymers out there that are available with a full complement of accessories such as PU Primers/DPM's, full epoxy DPM's and tools. They offer UK based telephone support from people who know what they are talking about so take a look at what's available, a little bit of Google goes a long way.
I'm not sure exactly where you are based but in the Manchester area you could call RGN Flooring supplies in Stockport on 0161 406 7557. They stock Rewmar adhesives.