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Thanks to all of you for help - now I will give you laugh of the day - I added some jam sugar, plus the juice of a lemon - left it to simmer while I had a cuppa, wait for it - fell asleep for 30 mins!! My husband went into the kitchen and came back and said 'will your marmalade be ok, just given it a stir and it seems fine' I shot through, and apart from being a darker colour it actually is setting and tastes a bit like burnt toffee - ho hum! such is life........