Just to feed back .........
The marked up Top 100s worked v well as backup and for relocating the route after overnight detours. The signage got off to a non-existent start from Dinard for several miles south - at one point with cyclists each relying on others coming the oother way to relocate the route the other side of major road junction crossing

. But after that it was great - just the occasional sign missing / hidden by a bush / missed by us. I can't comment on the availability of TdM leaftlets in Tourist Offices - in the end there was no time to check those out.
Re. the route itself, it's been planned out really well - all on v quiet lanes with bits of fine gravel track connecting them occasionally, and a handful of longer stretches of fine gravel. Bril for those wanting a relaxed potter, and would be ideal for inexperienced cyclists. But that did mean it was much slower riding than I'd expected. So with that and the hills - they're short, but lots of them, and with a young teenager stoker more out for the fun than for a workout

- we ended up with long days in the saddle, and still occasional short cuts on more direct roads. But still had an absolutely fantastic time. Both came home full of the joys of summer.
The other thing to note is that the coast is only in view maybe 30% of the time. I guess that comes with the planners' compromise of finding back roads. But that 30% is stunning. Have already suggested to Mrs C that we return to Brittany for a family hol

.
Oh, and the St Malo - Dinard ferry was great. Runs every 20mins, and a simple roll-on roll-off even for a heavily laden tandem.