Picked berries in County Durham in September, and popped them in freezer for 2 days before using. Went back to the bushes after the 1st frost, and they were shrivelled up-glad I picked them when I did!
Recipe: 1lb berries, 8oz castor sugar, 1 litre gin. Prick berries, put in an empty bottle, add sugar - this should take you to about half way up the bottle. Top up bottle with gin, seal bottle. Shake once day for a week, to dissolve sugar. Store for at least 3 months in COOL DARK place.
Stored my first bottle near to a radiator, and it exploded - berries everywhere, and a very sticky carpet! Now making a massive batch in a demi-john.