More dates have been announced for London Underground strike action this month.
The trade union for train drivers, Aslef (Associated Society of Locomotive Engineers and Firemen), announced it is to stage walkouts on Wednesday 26 July and Friday 28 July.
Strikes had already been announced by the RMT union, representing different grades and sections of Tube staff, on Sunday 23 July and Friday 28 July.
Read more:
Full list of July train strike dates