We all learn from each other "shan64", though it is obvious that you have NO CLAIM against B&Q due to not following there instructions. You see the thing is, by buying cheaper paints then you run the risk of things going wrong. But thee again that is why the B&Q instructions are worded the way they are i.e. to get more money out of your pocket in the long run. Also, the plasterer telling you to use 'watered down emulsion' can mean anything realy as there are loads of emulsions out there which CANNOT be used as an sealer with new/bare plaster, even when thinned down. Anyway, hopefully the peeling does not happen on all your walls at a later date, however, coat the problem wall with Zamix Superprime and leave to dry (i would give it at least 72 hours to be safe), then coat it with your B&Q emulsion. OR you could buy some of the B&Q new plaster paint and use that....................................