Partly right Spiney, the XP flight I believe started with a Trislander before upgrading to a Friendship, which departed about 2200 before returning in the early hours and then day stopping.
In those days we were busier at night than during the day, sometimes up to 60+ movements between 2200 and about 0130, comprising of small packages, Royal Mail and newspapers. Operated by all sort of companies and types, from Aztecs to Short 360s up to DC3. A lot of the Aztec and twin Cessna types were all single crew and more than happy to take crazy ATCOs around Europe in the middle of the night!