London Underground is advising Northern line users to check for delays before they travel this weekend.
Improvement works on Saturday and Sunday will mean the line is suspended between Hampstead and Edgware.
To reduce inconvenience, two rail replacement bus services will operate.
The first service will run southbound from Edgware to Hampstead, and northbound from Belsize Park to Edgware.
The second service will run northbound from Belsize Park to Canons Park, and take in Hampstead, Golders Green, Hendon Central and Edgware along the way, and in the reverse order for its southbound service.
For more information check the TfL web site on www.tfl.gov.uk/tubeworks, call 020 7222 1234 or check Ceefax page 436.
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