Britain's PM Cameron gestures as he speaks during a news conference in RigaLONDON (Reuters) – British Prime Minister David Cameron will promise on Thursday to stick to his executive's deficit reduction plan regardless of the loss of his u . s .'s top-notch AAA credit standing, saying Britain would plunge "back into the abyss" if he modified route. Speaking ahead of a March 20 funds in order to be dissected by the markets and rankings companies alike, Cameron stated there were signs his govt's economic insurance policies had been beginning to work and that it used to be imperative to "hang agency to the path". …