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There's not going to be any Lego this year, I can't move for the stuff - there's even a big set on top of one of the fish tanks.
The bag of doom is a huge bag with 24 wrapped 'gifts' (it's just sweets, etc - the same as they would usually get after tea). They take it in turns to pick one out, it's called the bag of doom because some 'gifts' are a bit rubbish compared to others. I started it last year as it is cheaper than the Lego/Play Mobil advent calendars (as I buy them sweets for after tea anyway). Christmas Eve they get a 'gift' with biscuits, sweets, popcorn, Pringles, coke, etc