Thanks for the link
SUCCESS, the very nice man at Countrywide H.O wrote back with an a possible explanation as to the cause (heat) and also told me that they have a Company Policy NOT to sell anything with LESS than a months' shelf life!!!!! I regularly get feed with less than a month as I order monthly and I guess they think, "oh, she'll use it". So from now on - nothing less than a month, means nothing less than a month

. That very nice man is also sending me some vouchers.
Thanks very much all. Good results all round. I'm now off for a glass of Cider to celebrate.
Cheers