I did that Coach-Air route London - Paris via Lydd and Beauvais in April 1975. We flew from Lydd on a Dan-Air Viscount G-BBDK which they leased (in full Dan-Air livery) for a while. Unfortunately coming back two days later the Viscount went tech and we had to hang around for a 748 (G-ASPL) which took us back from Le Bourget to Gatwick at around 2am. I can still recall the landing at LGW in a horrible gusty crosswind in rain - one of the few times I have ever been worried for my own safety in an aircraft.