Mr Brown's spokesman said: "These accusations at this point remain accusations and it's important that Sir Philip establishes the facts. Pending the outcome of his establishing the facts, that's the reason why Shahid Malik is stepping down."
Mr Malik claimed £66,827 over three years — more than any other MP— on his second home in Peckham. Former independent anti-corruption MP Martin Bell today branded MPs "pirates" and called on some to "walk the plank" for their expenses scams.
In a letter to the Standard, he wrote: "I spent last week in Somalia, very impressed by the idealism of politicians in a new province who are unfortunately powerless to do anything about the piracy off their coast.