Most people who set out to sail round Britain think of it as a strictly British affair: up the east coast, round the top, down through the Irish Sea and home along the south coast. We did it differently. We borrowed France for the southern leg, crossing the Channel and running west along the Normandy and Brittany shore before nipping back across to the West Country. It made the whole circuit more interesting, gave us better shelter, and added a stack of decent dinners.
This is the case for doing it that way, and how the French detour actually fits a round-Britain plan.
The distances, honestly
A circumnavigation of mainland Britain runs anywhere from about 1,800 to 2,500 nautical miles depending on how tightly you hug the coast and how many islands you take in. One well-logged trip clocked 2,422 miles; a more direct route came in nearer 1,800. Most cruising couples doing it properly, with weather days and detours, land somewhere in the middle and take a full season.
Adding the French coast does not lengthen it as much as you would expect, because you are substituting one southern shore for another rather than bolting on a separate trip. You swap the run along the English south coast for a run along the French one, joined by two Channel crossings. The Dover Strait at the eastern end is only about 18 nautical miles across at its narrowest, which puts the continent astonishingly close.
Why bring France into a round-Britain trip
Three reasons, in order of how much they mattered to us.
First, shelter and choice. The Normandy and Brittany coast is stuffed with all-tide marinas, drying harbours and anchorages, and after the exposed grind round the top of Scotland it is a genuine pleasure to have a soft, harbour-rich coast to coast-hop along.
Second, the sailing is good. The Brittany tides are big and the pilotage is rocky, which sounds off-putting but is exactly the kind of cruising that rewards attention. If you have never worked proper tidal gates, this coast teaches you fast, and our north Brittany cruising guide walks through the headlands and the timing.
Third, the food and the welcome. A round-Britain trip is long and can grind you down. A fortnight of French harbour markets and pontoon dinners is a tonic, and it costs less than you think.
Where the French leg slots in
Picture the circuit running clockwise: south from your home port, down the east coast, through the Channel, then back up the west. The French leg replaces the western Channel portion.
A workable sequence, coming down the east coast and into the Strait:
- Cross from the Kent or Sussex coast to the French north coast. Boulogne is a sensible first French port, and our Ramsgate to the French north coast piece covers that hop.
- Work west along the coast: the Baie de Seine, then Normandy proper.
- Cherbourg as the natural hub. It is an all-weather, all-tide harbour and the classic Channel waypoint. Read Cherbourg: arriving from England for the approach and the marina.
- West past the tidal gates of the Cotentin, across to north Brittany, then back over to the West Country to rejoin the British coast.
The tidal gates you cannot fudge
The French side of the Channel has serious tide, and two gates in particular will dictate your timetable.
The Alderney Race, the Raz Blanchard to the French, runs hard. Springs can push 7 to 9 knots through the gap between Alderney and the Cotentin, which is faster than many cruising boats motor. You time it for slack or the favourable hour and you do not argue with it. Our guide to the Alderney Race tidal gates gives the timing in detail.
Round the corner, the Chenal du Four and the Raz de Sein at the western tip of Brittany are the other big gates, again with strong streams that demand you arrive at the right state of tide. Plan these two pinch points first and build the rest of the leg around them, not the other way round.
Crossing back: the Channel as a tool
The two Channel crossings that top and tail the French leg are short by round-Britain standards, but they need respect, mostly because of traffic. The Dover Strait carries some of the densest shipping in the world, with hundreds of vessels a day moving through the traffic separation scheme. You cross it at right angles to the lanes, keep a sharp lookout, and pick your moment. Our crossing the English Channel by boat piece covers routes, timing and how to handle the shipping lanes.
The western crossing back to the West Country is longer and quieter, often an overnight, and it is the leg where a settled weather window matters most. The Channel can turn from benign to vicious in a day, so wait for the right pattern. Trying to keep a schedule across the Channel is how people end up offshore in conditions they would never have chosen.
A sample French leg, day by day
To make this concrete, here is roughly how our French portion ran. We were not in a hurry, and we took weather days, so treat it as a comfortable pace rather than a delivery schedule.
- Day one: cross from Kent to Boulogne, a short hop to clear in and find our feet on the French side.
- Days two to four: work along the north coast and into the Baie de Seine, with stops to wait out a blow.
- Day five: into Cherbourg, the all-tide hub, for fuel, water and a proper restock.
- Days six and seven: round the Cotentin, timing the Alderney Race carefully, then across to the Channel Islands or straight to north Brittany.
- Days eight to twelve: coast-hop the Pink Granite Coast and the rocky north Brittany shore, the pilotage highlight of the trip.
- Day thirteen onward: time the Chenal du Four and the Raz de Sein, then cross back to the West Country to rejoin the British coast.
That is under two weeks of French coast for a circuit that takes a whole season, and it transforms the southern leg from a chore into the bit you remember.
Gear that earns its keep on the French side
The French Channel coast asks more of your kit than a gentle English south-coast run, mostly because of the tide and the rock.
- A reliable tidal atlas or app, because you are constantly working streams that run hard.
- Up-to-date charts of the rock-strewn approaches, since Brittany pilotage punishes the casual.
- A good engine and clean fuel, because the tidal gates demand power at the right moment, not when it suits you.
- A working VHF and a watch on the right channels, given the shipping density at the eastern end.
None of this is exotic. It is the same gear you carry round Britain anyway, used more deliberately.
The paperwork side, briefly
Bringing a UK boat to France post-Brexit means a little admin you can skip on a purely British circuit. You should clear in at a port of entry, carry your ship's papers and passports, and keep an eye on Schengen days if you dawdle. For a round-Britain trip the French portion is short enough that the 90-day limit is not a worry, but the customs and flag etiquette still apply. The basics are in our sailing to France from the UK after Brexit checklist, worth a read before you point the bow south.
Would I do it again this way
Without hesitation. The round-Britain crowd treats the south coast as the home straight, a tired motor-sail towards the finish. By crossing to France instead, we turned the dullest part of the circuit into a highlight: harder pilotage, better food, new harbours, and the small thrill of a foreign coast on a trip that is supposed to be all about home. The two extra Channel crossings cost us a couple of weather days. The French coast paid them back many times over.
