Most routes (especially non-motorway) are dictated by the time available. How many days have you set aside for the ‘West Coast’ leg Calais > St Nazaire > Biescas, assuming you want to spend a full day of the total 14 days in St Nazaire itself?
From Sutton, it might be better to cross over via St Malo, if you plan to do St Nazaire and then west coast of France. But too late for that, I guess?
This is broadly the most direct (motorway or non-motorway) direction:
https://kurv.gr/E5WBz
Me? I’d probably cut a bit more inland to the east, roughly along the red line. But, that might well be dictated to some degree or another by how long you want to take getting to Biescas:
Something along these lines:
The section to St Nazaire from Calais, takes you close to Le Mans, where we go each June. This is one of the routes we take:
Yes, it takes the motorway at the start but that’s because we want to get there in the day, stop for lunch and still arrive in good time to eat, then go to the track to see qualifying in the evening, along with night time practice.
Le Mans’ish to St Nazaire is then a modest 180 miles or so:
Or you could not go via / close to Le Mans at all, but instead work you way through Normandy and into Brittany, along sort of this line:
Time, mixed in with stuff to see, really is the big dictator.
This thread (it’s a bit jumbled) sort of gives a basic starting point to answer your question:
Does anyone have fastest route with minimal tolls - mainly dual carriageway to St Jean de Luz that they could share, please? It'll save me having to plot one.
Thanks
That said, as it’s close on or over 900 miles (probably over thousand, once you’ve finished) - just for the first section - that you are asking for, some more information from your / your mate’s side might be handy; not least the days available for A to B and on to C to D and so on. For example, it’s assumed St Nazaire is a day standing still as it were. This affects B to C. Do you want more days off? Clearly, the distance(s) involved will show how many options there might and can be.
PS Take a gold star, Some bods ask for 1,000 mile routes, when they (and their six mates) are leaving on Thursday and it’s already Tuesday….