london britain government say friday decision rat agency moody downgrade country credit rat base outdated assessment plan leave european union moody low britain sovereign credit rat aa2 stable outlook aa1 assessments make brexit report outdated government spokesperson say statement provide finance ministry early friday prime minister theresa may give speech italy set wish transition period around two years britain leave eu march 2019. prime minister set ambitious vision uk future relationship eu make clear side benefit new unique partnership government spokesperson say make substantial progress reduce deficit find extra money national health service social care time complacent challenge ahead optimistic bright future spokesperson add britain say moody 's downgrade base 'outdated brexit view