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Keep going with them, they might come up yet. Almost everything I planted this year germinated with a couple of days, but the tomatoes took 2+ weeks to shown (plastic greenhouse), and the aubergines and peppers only appeared after 3+ weeks in the airing cupboard. This year's current title holder though is a solitary passion fruit seedling which has finally appeared after 5 weeks under heat.
Not sure what has happened to my seedlings this year, have cherry plum tommies and some aubergines but I think I may have been given some dud chili seeds as none of them have appeared which is rubbish in comparison to the bumper crop I had last year.