(Adds background on mobility issues)
LONDON, Aug 31 (Reuters) - Britain's Queen Elizabeth will meet Prime Minister Boris Johnson as well as his successor on Sept. 6 at her Balmoral Castle residence in Scotland, a Buckingham Palace spokesperson said on Wednesday.
The queen would usually meet a new prime minister at Buckingham Palace in London. The meeting at Balmoral, where the queen spends her summers, is a break from tradition and comes as the 96-year-old monarch experiences mobility issues.
The queen has also been reducing her public appearances in recent months.
She will have an audience with Britain's new prime minister - either Foreign Secretary Liz Truss or former finance minister Rishi Sunak - shortly after meeting with Johnson, the spokesperson said.
The winner of the contest to succeed Johnson as prime minister is set to be announced on Sept. 5.
