A very sound summary from FF.
The only thing I would add is given any route at least consider the options.
Depending where you are orginally coming from, Newhaven Dieppe is around 76 stat miles, where as, Lyd Boulogne Dieppe is around 86 stat miles. The first route has a large sector out of glide range of land, the second may have less than 5 or 10 minutes.
Personally I have never understood why people go SFD L2K when in the same way Lyd L2K is only a few minutes longer, however if going to the CI the trade off of time over the sea against distance is not sufficiently worth while, so go direct.