-It's the largest event of its type in the UK and thousands of people are expected to visit central London to see West End performances for free all weekend.
-Performances are programmed on stage 11am-6pm on Sat and 12pm-6pm on Sun.
-Entry is on a first come, first served basis.
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Those vying to be named the new Met Police Commissioner will speak to the Home Secretary, London Mayor and Policing Minister.
Monday's temperature was recorded at Kew Gardens, west London, where visitors enjoyed temperatures 10 degrees warmer than Milan at 8C.
The Central and Waterloo and City lines will be affected, with other stations and lines likely to be busier than normal.