If you go via Newhaven, it's a lot shorter, and the route is a LOT nicer than riding to Dover. Avoiding the A2 is a major pain, and adds around 30 miles. London to Newhaven is around 90k. It's an easy ride from Dieppe to Paris (not totally flat, but NOWHERE in France is totally flat, apart from the Crau and Camargue), and about 140k. I can't recall, but I think there is a night ferry (around 4 hours) so you can maybe ride down on Friday, overnight on the ferry, and the knock off the Frog leg on Saturday.
If you go via Newhaven, it's a lot shorter, and the route is a LOT nicer than riding to Dover. Avoiding the A2 is a major pain, and adds around 30 miles. London to Newhaven is around 90k. It's an easy ride from Dieppe to Paris (not totally flat, but NOWHERE in France is totally flat, apart from the Crau and Camargue), and about 140k. I can't recall, but I think there is a night ferry (around 4 hours) so you can maybe ride down on Friday, overnight on the ferry, and the knock off the Frog leg on Saturday.