Whilst Googling the still images of a Canberra incident mentioned in a post above from longer ron I came across a grainy clip of what is claimed to be a RAF Canberra crashing after take off following "catastrophic" loss of power. There appears to be no attempts to eject before impact.
BUT..I wonder if it was some sort of unmanned experimental flight-this somehow rings a bell to me???
Its on Liveleak.com - search Canberra.