BRITISH leader Gordon Brown has warned Iran it must freeze sensitive nuclear work or face more sanctions, in the first address by a British prime minister to the Israeli Parliament.

Mr Brown also attacked Iranian President Mahmoud Ahmadinejad's "abhorrent" threats against Israel and declared that Britain stood alongside the Jewish state.

"Iran now has a clear choice to make: suspend its nuclear program and accept our offer of negotiations or face growing isolation and the collective response of not just one nation but of all nations round the world," Mr Brown said.