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Seville oranges, which are available in late July/August, have a particularly good flavour for marmalade making.
If you haven't got a sugar thermometer, spoon a little of the marmalade onto a chilled saucer, cool for a few seconds then push a finger across it. If the surface wrinkles, it has reached setting point. If not, boil the marmalade for a further 5 minutes, then test again.