I recall being shown this approach by Bill Burnhope in the mid-eighties at Sywell. I was a fresh PPL and being checked-out on "the poor man's Spitfire", a Beagle Pup. "Now then young Strake" said Bill as we approached the active runway at about 1000ft, "Can you see the numbers?" Well, I just about could as they slid under the nose and told him so. "OK then, the cabin has just burst into flames and here's how we get down quickly". I had no idea what he was about to do but as he pulled beck the power and crossed the controls, we started to slip down at some speed and it dawned on me that he was going to try the impossible (to me) and land us on the runway. Needless to say, we touched down about halfway down the strip and came to a halt soon after. Most impressive and once I had learnt the technique, a very comforting party piece to practice from time to time.