London’s Heathrow Airport warned of further flight cancellations which would leave thousands more passengers stranded in the fourth day of delays after heavy snow swept across Britain.

The airport, one of the world’s busiest, cancelled 260 flights on Sunday, the equivalent of 20% of its usual schedule.

Meanwhile the Eurostar train service also cancelled four trains due to snow and ice.

As the bad weather that began on Friday looks set to continue into next week, Heathrow said it was cancelling 10% of flights planned for Monday.

“Latest forecasts for tomorrow show a high probability of low visibility conditions. This will reduce the capacity of the airport and without action would cause significant disruption to passengers and flights,” a statement said.

It said the cancellations on Monday would allow more time for other aircraft to take off and land, reducing the likelihood that there would be last-minute cancellations that would cause even more disruption to travellers.

Britain is braced for a continuation of the bad weather which has left hundreds of homes without power, closed schools and caused transport chaos in recent days, with several weather warnings in place for overnight Sunday.

Four climbers were killed in an avalanche in the Scottish Highlands on Saturday. The two men and two women were found dead after the accident near Glencoe, and another women is in critical condition.