Lord Coe and LOCOG Chief Executive Lord Deighton face questions about Olympics at London Assembly.
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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.
Rebecca Steinfeld and Charles Keidan want to secure legal recognition of their seven-year relationship.