I've just spent the best part of two hours scanning the 'net, for any clues to the beastie shown in the first post of this thread, to no avail.
The same picture appears on a handful of websites, and all share the same description which is lifted from the Associated Press website.
However, whilst searching, a couple of things crossed my mind which I thought I'd mention as they may get someone else thinking about it afresh.
If this is an RAF Rescue Craft as the description would lead us to believe:
a) Why is it so slow - Rescue craft need to be fast?
b) Why isn't it finished in a military scheme with recognition markings?
c) Why doesn't it have doors, lights, windows, armour, radio aerials, an MG mount, etc... ?
d) What advantage does it provide over the boats and/or Floatplanes that were already operating?
e) Why would RAF personel build a 'Rescue' craft from such a mish-mash of components, with reliability and ease of maintenance being high priorities for any emergency vehicle?
and finally...
f) Supposing the description was wrong, where else (and when) could this be? India?...
Andy