Anthony Guillaumier (Origins of Pre-stressed Concrete, September 19) adds some more details to my previous letter (September 7). I was writing from memory some 56 years after the event. Salvu Guillaumier used to come to my office quite frequently and I was full of admiration for his enthusiasm for new ideas, including glass, mirrors and aluminium.

When I left government service in 1965 he tried to persuade me to join him and others in a precasting venture at Ta’ Qali which I had to decline.

On the Portes des Bombes bridge, Anthony Giullaumier also mentions Frank Abela, who I knew very well, but I do not remember him being involved in the bridge.

He sometimes used to drive me around as I did not have a car in those days and I often worked very unorthodox hours and he was very kind. I confirm that the cost of 65,000 pounds I mentioned was for the whole flyover and not just the bridge.

The flyover, which was carried out with minimum interference with traffic, was not only an avant-garde example of geometrical and structural design but also a good example of project management.