I came across this t'other day, though I'm damned if I can remember where now! Don't know if it helps anyone.
Blackberry Wine Recipe
Ingredients:
2½ lb blackberries
½ lb sultanas
Campden tablets
2 lb sugar
Wine yeast
Nutrient
Water
Method:
Strip and rinse the blackberries..
Put into a fermenting bin and crush. Chop the sultanas and add to the bin.
Pour on 4 pints of water. Add 1 Campden tablet, crushed and dissolved in a little warm water.
Boil all of the sugar in 3 pints of water for 2 or 3 minutes and, when cool, mix into the pulp.
Add the yeast and nutrient and cover and allow to ferment for a week, stirring daily.
Strain and press and return to a clean fermenting bin.
Cover again and leave for 3 or 4 days.
Pour carefully into a gallon jar, leaving as much deposit behind as possible.
Fill up the jar with cooled, boiled water to where the neck begins.
Fit a fermentation lock and leave until fermentation has finished.
Rack, as necessary, adding a Campden tablet after the first racking.
Syphon into bottles.