Ebbie - re your suggestion I'm off to see if I can find a lovely man myself in Sainsbury's tonight

Seriuosly, this is a very good idea - as is emailing and/or writing to all the major supermarkets in your area (or to their head offices).

Also, along these lines - I have noticed that Holland & Barrett are very helpful to low carbers - perhaps they can be persuaded to stock some lc products.