An eye-witness account I posted in the "Flying under bridges, what and where?" thread:
Re. the Hunter and Tower Bridge, I actually had a good view of the event in central London. I was working as a site engineer supervising building of a block of flats near Vauxhall Bridge, in early April 1968. While checking the steel reinforcement of the highest floor slab before concreting, with my eye level about 50 feet above ground level, the Hunter roared past travelling downriver approximately 300 yards away.
I saw it pass over Vauxhall and Westminster Bridges, and very close to the then-new Vickers Millbank tower block. Anyone on the upper floors would definitely have been looking down onto it, and from my own vantage point I saw its full side view! Other tallish buildings then blocked my view of it as it swept towards Tower Bridge, so I didn't see it passing between the lower road deck and the upper pedestrian deck level, but the news media were full of it afterwards.
The newspaper accounts next day claimed that the pilot was due to leave the RAF quite soon anyway, and that he and colleagues were very dissatisfied with the half-hearted way in which the service was celebrating the 50th anniversary of its formation on 1st April 1918. He had accordingly decided to mark the occasion in a more robust and appropriate manner!