[Robert Williams]

The start time for the contest even went as late as 10pm in the late 60s/early 70s. This may be related to the fact that this was around the experimental period from 1968 to 1971 when the UK stayed on GMT+1 all year round, and thus would presumably have been aligned with CET during the winter (the contest was usually broadcast in March in those days, so before when the clocks would otherwise have gone forward) - although frankly it's making my head hurt trying to figure it out for certain!