Thank you for the Asda tip. I'll have a drive out. Where I live the
tesco/sainsburys etc often have things out of stock. We are lucky to
get cheddar cheese some days.
Thanks also for the web link and that the system has been tried before.

Now, why oh why all the flack & unkind comments. Do some people enjoy
getting the wrong end of the stick and then hitting the person with it.

Thanks again for the helpful comments