Engineering work is taking place between West Hampstead Thameslink and London St Pancras International, closing some lines early on Tuesday to Thursday mornings.
As a result, the 05:16 West Hampstead Thameslink to Sutton and 05:21 West Hampstead Thameslink to Rainham (Kent) services will start from London St Pancras International at 05:29 and 05:33 respectively.
You can use your tickets at no extra cost on alternative Thameslink services between West Hampstead Thameslink and London St Pancras International.
Check before you travel:
You can plan your journey using the National Rail Journey Planner.