More troubles in the second article/link that Lola has given.
"An extensive rail improvements programme involving up to 200 projects will leave five London stations fully or partially closed over the festive period.
The news comes as workers at Gatwick are set to vote on a Christmas walkout over a pensions row, and Unite expressed concerned that the closure of a baggage carrier could affect service at four major airports.
Rail passengers will face disruption for up to 14 days, with closures at Paddington, Liverpool Street, Charing Cross, Waterloo and Cannon Street affecting travel between many parts of the country.
There will also be no trains to or from London Liverpool Street between December 24 and January 2 as improvements are carried out.
Work at New Cross, south London, as part of the Thameslink programme means no Southeastern trains will operate to London Bridge and Charing Cross from December 24-28, apart from the Hastings services which will be diverted to London Bridge.
Those planning to fly abroad for the holiday period could also face chaos as workers at Gatwick airport are threatening to strike in a row over pensions.
Passengers could also be hit with further disruption as a baggage carrier plans to close operations at Birmingham, Gatwick, Manchester and Newcastle airports for financial reasons."
Looks like the bus may be the best option in some parts!