An area of east London is experiencing an unexpected influx of tourists.
Abbey Road DLR Station in Newham is proving a magnet for Beatles fans keen to pay homage to their heroes.
Unfortunately for them they are in fact more than ten miles from where they think they are.
Piers Hopkirk has more:
More top news
Paramedics were on standby outside the police cordon as armed officers stood by the property.
A team of researchers has taken samples from the ten busiest London Underground lines to work out which are the dirtiest.
The action comes on top of an emergency timetable which has seen hundreds of trains a day being axed.