intelligence agent and his daughter still ongoing but there are still many unanswered questions over as daniel holkins explains next. and i attack by the kremlin on u.k. soil for downing street it seems the case is all but closed russia is the culprit no questions or other. has the prime minister taken the necessary steps to make a formal request for evidence from the russian government given the gravity of the accusations at official request seemed like a reason the mosque but lost crew though says no such requests were forthcoming. we haven't received any official request from london we've told britain we're ready to respond if they file the request instead of filing the official request the u.k. continues to pull political stunts and moscow also said it would cooperate in a joint investigation within o.p.c. w. parameters it seems this offer was unacceptable to the u.k. government. has high resolution trace analysis been run on a sample of the nerve agent no answers from to reason may on that but the prime minister believes there's already enough evidence to make it highly likely this was an attack