A flame has been ignited at the Olympic cauldron, which was used at the 1964 Tokyo Olympics, at Tokyo's National Stadium to celebrate the city's successful bid to host the 2020 Olympics.
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After a frosty start, southeastern areas will be dry with increasing amounts of sunshine developing. It will remain cold throughout the day.
Higher food and petrol prices are expected to send inflation to its highest level in 28 months when official figures are released later.
The Prime Minister will detail her 12-point plan on negotiating Britain's exit from the European Union during a speech on Tuesday.