Dryden, I have at least a 50%+ failure rate with playfairs, so I only used the preamble hints to justify my guess. Fortunately, either missing the 3 letter acronym at the front, or using "THE" in error, still gave a couple of matches, so I knew I was on the right track. The final solution is very neat, and if the clues had been towards the upper end of Listener difficulty, I think this would have been a superb puzzle. I know my tunnel vision severely hampered the final switch, but the xword itself was not the most taxing solve this year. Still a vintage year for the listener, and not a bloody hare to be seen or found.