Hi,
I saw your post in pregnancy and glad you have posted here.
Firstly there is a great organisation called Message Paris which may be able to help you, although being in Brittany, the uses you get from it may not be the same. There are some great resources for non-French speaking mothers though.
Can I ask why you are having the baby in England (none of my business, I know). I just think from an admin point of view it is so much better for the baby to be born in the country where you are going to live. I have had one baby in France and DC2 is due in 4.5 weeks (roughly :) ) - the support in hospital is good, but you don't get a lot post-birth. The organisation you need is the PMI (I think, the Protection Maternelle et Infantile). You should have a local one in Brittany and I suggest contacting them. If you are declared as pregnant in France they should contact you automatically - we had a local mw from the PMI who came out to visit us pre-birth to check that we were OK and had everything we needed. They also do drop-ins and I was able to take DD there to get weighed.
Do you or your husband have a Carte Vitale or a mutuelle here in France? The benefits are so much greater if you do and you will find support to fall back on.
Normally a baby born in France is seen in the first couple of weeks by your GP or Paediatre (effectively a child's gp, not private). In my case I needed to make the appt in the first couple of days post birth. They are seen fairly regularly by their doctor in the first nine months of life, and the carnet de sante, issued at birth is a great resource for keeping on top of what appts should be made and what the schedule is.
My experiences have been very positive here in France, I have a great paediatre and have a great mw. They both advocate natural approaches and minimal intervention where possible.
The one thing I found about giving birth in France is that the five days spent in hospital for a first child are hugely helpful, generally your milk has come in and you have the baby blues bit out of the way and you go home knowing how to give a bath and change a nappy. Obviously it's all about who you see and what your HCP are like, and the approaches aren't all the same to the UK.
Not sure any of this has been helpful, but keep posting questions and good luck with it all.