You can find Jill's Natural Preserves in all sorts of places - even at London's famous Borough Market where she takes stall 47 in the Green Market area every 2nd and 4th Saturday of the month.

http://www.boroughmarket.org.uk/index.php

And Jill does the rounds at Somerset's equally famed farmers' markets: 

http://www.sfmdirect.co.uk/markets/criteria.asp

Here are a couple of other good local links too: 

http://www.foodlinks.org.uk/

 http://www.foodtrails.co.uk/home.asp?county=Somerset