What is the postal code of park lane London England?

Firstly, there is more than one Park Lane in London so you will have to specify which one you are referring to. Secondly, British post codes are quite specific, typically with around ten residential addresses per post code. If the Park Lane that you are thinking about is the one in central London with several well known hotels, as an example, the post code of the Grosvenor House Hotel, 90 Park Lane London, is W1K 7TN. Other premises in Park Lane will probably have a slightly different post code although they will most likely start with W1K.