There is currently no service between Baker Street and Aldgate due to a faulty train at Baker Street earlier this morning.
There are also severe delays between Wembley Park and Baker Street.
Elsewhere there are minor delays on the rest of the line.
Transport for London say Underground tickets will be accepted on Chiltern Railways and local bus services.
Workers are trying to clear a tree that has fallen onto the Metropolitan Line.
Transport for London say that trains are not calling at Northwood whist it is being removed.
Passengers travelling between Watford and Croxley are warned that they must change at Rickmansworth.
A signal failure at Barbican is causing problems on the tube this morning, affecting the Circle, Hammersmith and City and Metropolitan lines.
There's currently no service between Barking and Moorgate on the Hammersmith and City Line or between Baker Street and Aldgate on the Metropolitan line.
Tickets are being accepted on local buses.
Severe delays on Metropolitan Line due to lack of available trains.
There is currently no service on the Metropolitan Line between Rickmansworth and Amersham/ Chesham because of a power failure at Chorleywood.
All other tube lines are running a good service.
Severe delays on Metropolitan Line between Harrow On The Hill and Watford, between Harrow On The Hill and Chesham and between Harrow On The Hill and Amersham due to earlier signal failure at Moor Park.
Service suspended on Metropolitan Line between Northwood and Watford, and between Northwood and Rickmansworth and minor delays on the Amersham and Chesham branches due to signal failure at Moor Park.
Minor delays on Metropolitan Line between Harrow On The Hill and Uxbridge due to earlier signalling problem at Rayners Lane.
It was time to say goodbye to the oldest tube train in London.
When the fleet first came into service on the Metropolitan Line John F. Kennedy was President of the USA and the average house price in the UK was a little under £3,000.
That was 1961, 50 odd years later, the last of that fleet ran for the final time.
Simon Harris was there to see it.