Tube travellers suffered a series of hold-ups today - just days before the start of the Olympics.
A late finish to engineering work meant severe delays to those using the Circle and District lines in the early part of the morning rush-hour.
There were then further delays later in the morning on the Circle and District lines following a signal failure at Gloucester Road in west London.
A signal failure at Lancaster Gate also caused delays to Central line services today.
The difficulties today followed the part-suspension of the Bakerloo line during yesterday's morning rush-hour following a fire alert at Charing Cross underground station.