ENGLAND FAILS TO GET TRADE ADVANTAGE LONDON, March L Answering a ues- , tioa In the House of Commons today Earl Percy, under secretary for foreign affairs, said he regretted that the British representations repre-sentations at Washington regarding the injurious effect on British trade of the reciprocity re-ciprocity treaty between the United States and Cuba had been fruitless owing to the fact that the United States held the view that the most favored nation clause did not relate to privileges granted to third persons in return for special concessions.