Rucksacks in London

dennisd

We're off on a sightseeing trip to London in two weeks. Security wise things have changed since our last visit over 30 years ago. We prefer to provide our own food and drink when were out for the day, we just usually carry it around in a rucksack. My question
is , can we take a rucksack into the likes of Madam Tussuad's, The London Dungeon and the Tower of London?