russian yuri nevski - london ambassador dmitri makienko - secret agent sasha makienko dmitris wife egor ivanovic - director , fsb swiss colonel schilling swiss air force base commander , payerne english joint intelligence committee ( jic ) members sir robin algar chairman and cabinet secretary sir fredrick forsythe permanent secretary , foreign office james burgess - permanent secretary , home office sir len watkins permanent secretary , ministry of defence general pearson-jones - chief of defence intelligence staff ( dis ) sir michael richards - head of mi6 ( c ) robert neil - head of mi5 ( m ) head of special branch brian newman section 11 bill clayton ( s ) head of section ( col. retired ) barbara wilkinson - pa to s commander nick marsden deputy head ( special boat service ) maj. peter northcot new recruit ( mi5 ) dusty miller staff sergeant , sas albert whistler piper duty officer archie driver clive newell - ex-special branch brian drake head of communications nigel mynott - it specialist spy committee david poulson - mi5 frank browne - mi6 stuart carrington - gchq medical personnel raf brize norton tactical medical wing annie mackie rn petty officer medical assistant ( arctic team ) military wing , selly oak hospital. , birmingham col mark graham - i/c trauma unit .