here in medway (south east) we have had the same problem with gritty bud only a £10 though lucky i just thought it was nothing until i found this thread

luckyly i do get to grow my own and it will be ready in a month or so
Aaron19 Reviewed by Aaron19 on . CONTAMINATED BUD... Orite folks, (UK!) It's been around a while now and I'm wondering how many of you have come in to contact with it. I'm talkin about the contaminated bud that most street pharmacists now seem to have. The contaminating substance is identifiable by a sandy/gritty texture in your mouth. You don't necessarily have to 'munch' on a bud to get that substance in your mouth; sometimes when the gummy on the Rizla is licked it gets transfered... Any how, anyone got anything to add cuz I fink its Rating: 5