The Royal Family,
Judging from the presence of Captain Mark Phillips and Fergie, this tableau dates somewhere between 1986 and 1992. For me, the key note is that the likenesses aren't particularly good, especially The Queen and Prince Philip who, after all, had been around long enough to get right. My beloved Louis Tussauds in Great Yarmouth managed a similar effect on much less money.
In a huge Island of Terror coup, we have managed to track down a copy of the very same postcard that, up until 2002 (when he lost it on the night bus) was in the possession of Prince Edward.