Kenwood: the boot gets the boot.

So, what became of the boot? Local magazine Surrey Life has uncovered the answer. It turns out the boot was at Kenwood for no time at all.
To be brief, John quickly grew tired of it, and so it was donated to the local Rag Week (an annual event where British students raise money for charity, often by being irritating). In this case, the boot was hollowed out, put on wheels, and pushed to Luton in a sponsored event. What became of it thereafter I don't know, but it probably didn't survive. A fitting end, somehow.

Kenwood: winter, 2008.

...and the same view 40 years later, courtesy of Joe Baiardi. Thanks to him for sending this in.

(NB: Joe's images should not be reproduced without his permission.)

Kenwood: spring, 1969.

An image (at least purported to be) from spring, 1969. It's still unclear when John and Yoko finally vacated Kenwood, but possibly around then.

Kenwood: attic - June, 1967.

Yet another attic photo appears, this time showing the hitherto unseen end of John's studio, which turns out to have housed... yet another piano. Surprisingly enough.