How much money do I take on vacation?

Hi, this may be a stupid question, but I m going to London in a few weeks with my family (3 people) and we can t figure out how much money we should take. The hotel and the plane tickets are already paid for, so all we re gonna spend the money on is food, public transport, entry fees and occasionally souvenirs and... show more Hi, this may be a stupid question, but I m going to London in a few weeks with my family (3 people) and we can t figure out how much money we should take. The hotel and the plane tickets are already paid for, so all we re gonna spend the money on is food, public transport, entry fees and occasionally souvenirs and stuff. So, what is the perfect amount you would recommend? We ll stay there a week and we are not huge spenders. Thank you so much for your answers, my dad was usually the one who handled the money, but as this is the first vacation without him, we re quite helpless and will appreciate any help.
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