
John and George, pictured outside the front door at Kenwood, apparently (see comments) on June 12, 1965. This was the day news broke (widely) (again, see comments, if you like) about their being awarded the MBE. Note the naked-lady knocker. Note too George's get-up: the same (sans hat) as the back of Rubber Soul and the UK Help! album (I don't know about the US version - I don't have a copy of it). The photos of John on the rear of both of these were certainly taken at Kenwood, and I wonder (though not very often) if any of the others were too.
Another artefact associated with this date is the warrant sent to Ringo to inform him that he was also being so "honoured", marked the twelfth day of June, 1965:

Obviously, the other three would have received a warrant too, but, as far as I know, Ringo's is the only one to surface so far. John's MBE was recently discovered lurking in the bowels of Buckingham Palace during a spring-clean; there's talk of putting it on display somewhere or other.
Thanks to Simon, and to M.