- 26 April
- 1868 – Two trains collide at the Metropolitan Railway's Swiss Cottage station (now closed) injuring three.
- 1870 – Great Eastern Railway opens branch from Lea Valley junction to Shern Hall Street, Walthamstow.
- 1926 – A gyratory system is introduced in Trafalgar Square so that all vehicles travel clockwise around the square.
- 1971 – The government announces that Foulness, Essex has been selected as the site of London's third airport over the Roskill Commission's recommendation for Cublington, Buckinghamshire.