Pakistani President Asif Ali Zardari has arrived in London. The visit has assumed significance in the backdrop of Premier David Cameron's warning that Pakistan must stop promoting export of terror. Cameron, whose comments in India about Pakistan looking both ways on terrorism sparked a diplomatic row, has also flatly rejected Zardari's contention that the NATO forces were losing the battle in Afghanistan. Zardari is facing criticism for not cancelling the official visit to Britain after Cameron's comments in India, and also for being away from Pakistan at a time when the country is facing unprecedented floods. On his part, Cameron refused to back down on his remarks he made in India and said he had no regrets over his comments about Pakistan's involvement in terror. He said the two countries' relationship could survive speaking frankly about problems.