Prince Philip, Queen Elizabeth’s 99-year-old husband, was admitted to hospital on Tuesday evening as a precautionary measure with an ailment that is not Covid related.

“The Duke’s admission is a precautionary measure, on the advice of His Royal Highness’s Doctor, after feeling unwell. The Duke is expected to remain in hospital for a few days of observation and rest,” the statement said.

The prince had been feeling unwell for a short period and he walked into hospital unaided, a royal source said. He does not have a Covid-19 related illness, the source added.

Queen Elizabeth and the prince have been staying at Windsor Castle.