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The back-up runway needs to shift 12 metres northwards to meet that safety rule.

As fresher water doesn't sink as easily, this is expected to slow the circulation and so bring less saltwater northwards from the tropics.

The iceberg is spinning northwards from Antarctica towards South Georgia, a rugged British territory and wildlife haven, where it could ground and smash into pieces.

A zone of wet weather will continue to move northwards across England and Wales overnight, turning readily to snow as it interacts with the cold air that is sitting across the UK.

It began to move northwards in 2020 but, since the spring, has been spinning on the spot after it was caught in a rotating column of water near the South Orkney Islands.