The closures in July and August will permit for enchancment work between Heathrow and Cockfosters.
Source : https://www.bbc.com/news/articles/cye01ny63z1o
Piccadilly line to partially close ahead of new trains
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The closures in July and August will permit for enchancment work between Heathrow and Cockfosters.
Source : https://www.bbc.com/news/articles/cye01ny63z1o