Share 'Seeking information: Vernon Heath and the Japanese embassy of 1862'

Does anyone have information about British photographer Vernon Heath (1819–1895), and specifically about the photographs he made of members of the diplomatic mission from Japan who visited London in 1862? I have information (but no confirmation) that the date these photographs were made was June 11, 1862, and that Christie's sold a lot of Heath's Japan photographs in 1998. I do not know where tho…