European champion Derek Pugh improved the championship record by a tenth of a second to 47.3 s in the final.
United Kingdom
Preliminary round
23 August 1950, 6:30 p.m.
The preliminary round was carried out in six runs. The first two athletes per run - highlighted in light blue - qualified for the semi-finals. In contrast to other competitions, the distribution of the participants in the preliminary runs was reasonably balanced in this discipline.
↑ The information in the sources mentioned on the IAAF homepage and todor66.com differ here. On the page at todor.com, additional athletes are listed whose participation seems very likely, because the division of the preliminary runs looks much more balanced overall. However, there are also clear misstatements in the case of athletes who are mentioned several times in one and the same heat or in different heats. The most likely variants are listed in the article here.