Network Rail and Thameslink bosses face the London Assembly's Transport Committee later.
Rail executives will be questioned over recent overcrowding and chaos at London Bridge station.
Commuters faced weeks of disruption because of reconstruction work at the station.
More top news
Incredible footage has been released by Surrey Police of a police chase which ends with the suspected stolen car knocking down an officer
It follows a winter that saw some animals killed by bird flu.
Satellite images show how the country has turned from green to brown after weeks without rain.