Steve.........
Your Hunting Clan Vickers 732 Viscount would have been one of either G-ANRR, G-ANRS or G-ANRT. Did the flight really operate from Wilson (actually Nairobi West in 1958) ? More likely operated from Eastleigh, just before it closed to civil traffic. Embakasi opened in April 58.
Oh, how I envy you your flight on G-AKNO......
Planemike