The website is http://vinenursery.netfirms.com
They hold the national collection of vines. They also have heritage tomatoes and potatoes, as well as English wines.
This is the only week-end that you can buy from them directly - it's mail order only for the rest of the year. Entrance is free and they sell refreshments which are usually very good.
We're going for the 3rd year running to add to our collection and get more advice.
