You are 100% correct, it's a Halifax, very similar to a Lancaster however the Halifax has it's tail wings on top of the fuselage, while the Lancasters is lower.
Link:
http://www.google.ca/imgres?imgurl=http://www.rafbombercommand.com/pics/archive/four_c_five.gif&imgrefurl=http://www.rafbombercommand.com/aircraft_heavy.html&h=278&w=370&sz=15&tbnid=aFdDB9_pOjrPgM::&tbnh=92&tbnw=122&prev=/images%3Fq%3DHalifax%2BBomber&hl=en&usg=__Atghl3EES1UXVWABXAiCej7FCSI=&sa=X&oi=image_result&resnum=5&ct=image&cd=1
