The London Landmarks Half Marathon has been held in early April since 2018. It is run by the charity Tommy's, and most runners raise money for dozens of charity partners. It is London's only half marathon through Westminster and the City on closed roads, and the route has two personalities: the Grand, with the capital's most famous views, and the Quirky and Hidden, with little-known corners highlighted along the way. Expect costumes, music and big crowds. Afterwards, visit St Paul's Cathedral and the Tower of London, explore East End markets or settle into a City pub.
An easy run with a local club the day before the race — the best way to shake out the legs and meet the city.