伦敦去朴茨茅斯

从伦敦希斯罗机场怎么去朴茨茅斯呢？刚刚在网站上看到了他们要工程检修什么的消息（网址如下），那是不是就不能坐火车了呢？
No trains will run between Hammersmith and Moorgate. Because of this engineering work there will be no interchange with the London Underground at London Paddington, Farringdon or Moorgate.
District Line
No trains will run between Tower Hill and Dagenham East. Because of this engineering work there will be no interchange with the London Underground at West Ham or Barking.
Buses will run between:
Canning Town and Tower Hill
Mile End and Barking
Dagenham East and Barking

Hammersmith & City
No trains will run between London Kings Cross and Barking. Because of this engineering work there will be no interchange with the London Underground at London Kings Cross, Farringdon, Moorgate, London Liverpool Street, West Ham or Barking.
Jubilee Line
No trains will run between Stanmore and West Hampstead. Because of this engineering work there will be no interchange with the London Underground at West Hampstead.
Buses will run between:
Stanmore and Stonebridge Park
Wembley Park and Finchley Road

Metropolitan Line
No trains will run between Harrow-on-the-Hill and Aldgate. Because of this engineering work there will be no interchange with the London Underground at Harrow-on-the-Hill, London Kings Cross St Pancras, Farringdon, Moorgate and London Liverpool Street.
Buses will run between Wembley Park and Harrow-on-the-Hill.
Northern Line
No trains will run between London Charing Cross and Camden Town. Because of this engineering work there will be no interchange with the London Underground at London Charing Cross and London Euston.
Planning your Journey
For more information, please use the Transport for London Journey Planner