EXCUSE ME, CAN YOU TELL ME THE WAY TO..., PLEASE?
HOW CAN I GET FROM ...... TO ....., PLEASE?
Take the (colour) line, (number ) stops to the (North, South, West, East).
Change to the (colour) line, (number) stops to the (North, South, West, East).
http://content.tfl.gov.uk/large-print-tube-map.pdf
Here you have the official map from the Transport for London website. Click on the link.