Last connecting trains 'could be at 16:30 BST'published at 08:26 British Summer Time 18 May 2016
More travel warnings from the rail operator - that passengers' last connections could be as early as this afternoon and before the evening rush hour.
The company advised: "For people travelling to stations between Crawley and Chichester, between Hove and Littlehampton/Bognor Regis, or between London Road (Brighton) and Eastbourne, your last connecting train from London may be as early as 16:30."