A Google will tell you asap, but fair dos
The postcode is TW6 2AQ from memory and it's on Bath Road. Go down the M4 spur toward Heathrow from J4. Upon reaching the end of the spur, go over the 1st roundabout (under the A4 flyover). Next junction turn off left, straight on is the tunnel (where the Concorde model used to sit). Miss the turn and you will be lost in the warren that is Heathrow
Your challenge now is to find the route back onto the M4. The signposts take you down the A4 to the M25.
