Eurostar chief executive Richard Brown has apologised to passengers who were trapped in a tunnel overnight before Christmas.

In a personal letter to up to 5,000 customers affected, he outlined a number of improvements to the rail operator’s service that are being implemented.

Brown said that passengers will now get better quality information in the event of a breakdown,  there will be more station staff and there would be more food and water stocks on trains.

During bad weather, trains will run more slowly to stop them being engulfed by “snow clouds”, which are thought to have caused some of the problems.

About 100,000 customers caught up in the three days of cancellations in the lead-up to the Christmas break will share a £10 million compensation package.

An independent review is due be published at the end of this month.