They used to sell the plum pudding on Amazon, but apparently not anymore; and it doesn’t appear in the Company’s website either; but it was wonderful. I think the last time I saw it in the Giant Food or Safeway was about 8 years ago:
http://www.amazon.com/Crosse-Blackwell-Pudding-Plum-14-0000/dp/B0048IKXB6
The various Atora products are still available:
You can also try British Superstore which sells tons of British goods.