If you're interested ...
I have some old ABC Airways Guides, the earliest from May 1958. Southampton’s schedules at that time are listed as:
Silver City Deauville & Cherbourg Bristol 170 (car ferry)
BEA Jersey (Dakotas)
Jersey Airlines Guernsey & Alderney (Herons)
Cambrian Airways Cardiff-Bristol-Southampton-Paris LBG (Herons and Dakotas)
And an Airviews Manchester-Sandown service with an ‘optional landing’ at SOU (Rapides)
Plus Aquila Airways Short Solents from the Marina to Lisbon, Madeira and Santa Margherita (for Genoa)
By May 1964 BEA, Airviews and Silver City had gone, as had the Alderney service. Jersey/Guernsey were all Jersey Airlines Dakotas, the Cambrian service was still operating and there was a Fairways Dakota service to Rotterdam.