FXstreet.com (Barcelona) - The Sterling has tumbled gain today, the ActionForex technical team the Pound is regaining downside momentum: GBP/USD is now pressing an important support zone of 1.9550/600 level and seems to be regaining downside momentum. If te Sterling breaks support at 1.9550, according to the ActionForex team, much deeper decline could be ahead: Sustained break of this support zone will confirm that the medium term up trend that started at 1.7047 in 2005 has already completed and much deeper decline should then be seen.