I personally use JWB for Sam, although Purely states it is hypoallergenic - I dont like the smell of it though, so they dont get a lot of that. You can buy individual tins of Classic in Wilkinsons, it stopped Sam's gums being red in a couple of days, but now the fussy butter wont eat it!!
Jane - it is on offer in PAH at the moment, £9something for 24 tins.