Pressure is increasing for the former prince Andrew to give evidence to a US congressional committee investigating the convicted sex offender Jeffrey Epstein after Britain's prime minister suggested he should testify.

Keir Starmer declined to comment directly about King Charles III's disgraced younger brother, but told reporters travelling with him for the Group of 20 summit in Johannesburg that as a "general principle" people should provide evidence to investigators.

"I don't comment on his particular case,'' Starmer said on Saturday (Sunday AEDT).

"But as a general principle I've held for a very long time is that anybody who has got relevant information in relation to these kind of cases should give that evidence to those that need it.''

The former prince, now

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