In the best traditions of the Shavian sugar-coated pill (as devised by George Bernard Shave himself), televisual sweeteners were offered to viewers to help the pedagogical medicine go down, medicine go down, in the most delightful way. So one minute a bunch of happening, get-on-down teens were free-styling with their balls to rap music, then the next, Matt Baker and Liz Barker had plunged us into a potted biography of Henry Ford, to celebrate the centenary of his first motor factory. There was a visit to the Blue Peter garden, too, but it appeared to have been grassed over and transformed into a small cricket pitch, on which Phil Tufnell was displaying his googlies to a mesmerised group of small boys. Poor old Percy would be turning in his grave if he knew, which would actually be rather a useful thing to do, because it aerates the soil. How very typical of the man.