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I don't think there were any spoilers - I do remember an exchange between Dad and Jake though where it nearly came out in front of Karen. It ended with Dad giving Jake a bit of a look as if to say "she still believes, don't ruin it you idiot". So it depends on how clued into that you think she'd be.
My daughter (aged 9) loved Outnumbered series 1 and 2 and has asked for series 3 and 4 for Christmas. She still fervently believes in Father Christmas so I am wondering if any Outnumbered fans could tell me - will watching any of the episodes in Series 3 and 4 wreck that for her? As indeed would the Christmas Special from 2009? Any help? Thanks!