I recently acquired Dot Jarlett's clippings archive, for the princely sum of 50 quid. Lots of innaresting bits and, moreover, bobs. The earlier ones were apparently cut out by John himself... and here is the very earliest, providing shurely the first press mention of Kenwood, from the Daily Herald, Wednesday July 15th 1964.
This picture, then, taken before the Lennons took up residence - and one wonders what they were doing giving interviews about the place when it was supposed to be a big secret.
Download and zoom in to read.