Its an old one of a Javelon missle hitting a Centurion in a test...It was on another U-tube mislabeled an an M-46 and later identified as a 1950s Swedish tank. Possibly another tank, as the other did not look like a Centurion in any way and these target tanks were RCd.
A hit with a modern missle means the crew goes very quick and there's nothing much the medics can scrape up to put in a body bag.
http://www.youtube.com/watch?v=z3AJfTBig0E