Chop the bones into medium pieces, place in a large saucepan, cover with water and bring to the boil. Drain, return the bones to the pan and cover with fresh cold water. Add the remaining ingredients, bring to the boil, then reduce the heat to low and simmer for 2½ hours, skimming the scum from the surface regularly. Strain, discarding the solids.
This can be made up to 1 day in advance and stored in an airtight container in the fridge.
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