New year, new rules: what changes around the world from 1 January

British rail fares will rise again this year and Californians will be able to buy marijuana legally for recreational purposes

Saudis and Emiratis will pay more tax, the Swiss will pay less, Brits will start taking more expensive train journeys and China will stop taking in the world's rubbish.

These are some of the changes that will take effect as the world ticks over into a new year.