LONDON, Oct 23 (Reuters) - Turkish troops can enter northern Iraq in pursuit of Kurdish rebels "at any time" under the terms of its parliamentary mandate and Iraq should understand this, Prime Minister Tayyip Erdogan said on Tuesday. "Right now we are in a waiting stance but Iraq should know we can use the (parliamentary) mandate for a cross-border operation at any time," Erdogan told a joint news conference with British Prime Minister Gordon Brown in London. The Ankara parliament last week granted permission to Turkish troops to conduct cross-border incursions into northern Iraq, but Erdogan's government has signalled it will give diplomacy more time.