The Duke of Edinburgh has been admitted to hospital as a "precautionary measure" after feeling unwell.

A Buckingham Palace spokesperson said the 99-year-old is "expected to remain in hospital for a few days of observation and rest".

He was taken to hospital on advice of his doctor and is said to be in good spirits.

A royal source said Prince Philip does not have a coronavirus-related illness and walked into hospital unaided on Tuesday evening.

The source added he travelled there by car and was not an emergency admission.

It is understood the decision to admit him was taken with an "abundance" of caution.

Buckingham Palace said in a statement: "His Royal Highness The Duke of Edinburgh was admitted to the King Edward VII Hospital in London, on Tuesday evening."

(With input from agencies)