Summary from the original article

Buses will replace trains as a significant investment on the Brighton Main Line over the February half-term will improve the reliability of the route into the future.
By Matt Pole ·
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Upgrade this serverTrains leaving Bognor Regis are being delayed this morning (Wednesday, November 11) due to a fault with the signalling system.
17 hours ago · sussexexpress.co.uk
Buses will replace trains as a significant investment on the Brighton Main Line over the February half-term will improve the reliability of the route into the future.
Yesterday · sussexexpress.co.uk · You are reading this one
Direct 30-minute transfers will run every 15 minutes
2 days ago · independent.co.uk