Ooh good tip dreaming 
Holes in the ground ... I remember the horror of those from trips to France as a child. Haven't seen them for years and probably wouldn't bother me so much as an adult!
Thanks for info re hi-vis jackets/breathalysers too.
Comtesse you got me very excited about the possibility of a dishwasher then, but we are just in the most basic chalet I think (booked through Brittany Ferries as was cheaper) so washing up for us.
Great info re supermarkets/markets.
Any suggestions for day trips/rainy day activities very welcome ... For rainy days I was thinking of taking a few games/craft things to play in the caravan plus I think there's a games room and indoor pool.
Day trips - I've got beaches (Kelenn), Ile de Batz, maybe Brest? Have a 4.5 yo and nearly 2 yo. Also maybe something to do when we arrive, as ferry docks at 8 am but presumably we can't check in to Mouette until 2 pm or so.
Was it someone on here who said the chalets don't have ovens, just hobs, or did I imagine it?
I will add my own tip for those with small children who don't like being showered - very small paddling pool for bath time (we do this on camping trips too).
Thanks again all for your input, I am feeling properly excited 