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Put all the ingredients, except the sugar, into a large pan and stir well. Bring slowly to the boil, then reduce the heat, cover and simmer for 10 mins, until the plums are tender.
Stir in the sugar plus 2 tsp salt and keep stirring until it has dissolved. Boil the chutney for 20-30 mins, uncovered, stirring occasionally to prevent it catching on the bottom, until it is thick and pulpy.
Pot into sterilised jars (see Know-how, below), seal, label and store for at least 2 weeks before eating. Will keep for up to 6 months in a cool dark place.