The official 221 Baker street was actually (in modern times) the offices of Abbey National. The current museum was about at that time too but is located between

The official 221 Baker street was actually (in modern times) the offices of Abbey National. The current museum was about at that time too but is located between 137 and 140 Upper Baker Street. The location of the original 221 is not known for certain because of street renumbering and destruction during the Blitz.