TEHRAN (AFP) - Iran ruled out cancelling the disputed presidential vote on Tuesday, issuing a new warning to the leader of the Opposition and lashing out at UN meddling as it battles the most serious challenge to the Islamic regime in 30 years. As international alarm over the crisis mounted, Britain expelled two Iranian diplomats and European nations hauled in ambassadors to express alarm over fresh post-election violence on the streets of Tehran. Prime Minister Gordon Brown announced the expulsion of two diplomats after Tehran ordered two British diplomats to leave. Brown said Iran had taken the unjustified step of expelling two British diplomats over allegations that are absolutely without foundation. In response to that action we informed the Iranian ambassador earlier today that we would expel two Iranian diplomats from their embassy in London, he told lawmakers. But the top election watchdog, the Guardians Council, insisted the vote would stand. We witnessed no major fraud or breach, spokesman Abbasali Kadkhodai said on English-language state television Press TV. Interior Ministry also warned Mousavi to respect the law and the peoples vote after his presidential election defeat, state-run IRNA news agency said. In the latest European moves, France, Finland and Sweden summoned the Iranian ambassadors in their capitals, with Paris protesting at the brutal repression of demonstrators. An Iranian lawmaker was quoting as saying by the official IRNA news agency that Tehrans Ambassador to London would be recalled for consultations, but this was later denied by a Foreign Ministry source to AFP. London is pulling out families of embassy staff and, along with some other EU nations, warned its nationals against travel to Iran. Guardians Council, which has acknowledged there were more votes cast than eligible voters in 50 of 366 constituencies, is due to make its final ruling Wednesday (today).