Most restaurants include tips in the total bill. As a rule, the tips here range from 10 to 15%. Leaving tips in pubs is not common.
Under no circumstances leave your personal belongings unattended, even in a car that has been rented. Special guarding parking is the best place to leave your car as there are quite many car thieves in London.
Local residents are distinguished by politeness and restraint, so visitors need to reciprocate any sign of attention. In the stores you show greet the seller; make sure you hold the doors when entering or leaving the premises, and if someone helps you, you certainly need to thank.
Londoners are very fond of pets, so in any case you should not demonstrate your aversion to cats or dogs publicly.
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