I say again, to fly through Tower Bridge on a whim, while it was covered in traffic and people, was not ' good airmanship ', it was plain foolhardy, or despite Flying Lawyer's objections, the colloquial term ' criminally stupid ' springs to mind.
By 2009 standards, probably; but it was 1968, of its time perhaps. And if it had been a Bucc then he would have flown under (new) London Bridge as well