The Queen was joined by Prince Philip and the Duchess of Cambridge for a visit to Baker Street tube station today to mark the 150th anniversary of the London Underground.

Pregnant Kate, 31, was given one of the ‘Baby on Board’ badges worn by mothers-to-be on the tube. ‘I will wear it at home,’ she joked. ‘I used to use the Tube on a regular basis. I miss travelling on the Tube.’

It’s the first public appearance by the Queen, 86, since she was taken ill with gastroenteritis earlier this month.