It is worth having a read here
http://www.nhs.uk/NHSEngland/Healthc...einFrance.aspx
As the ehic (e111) card may not provide as much cover as you expect. In a lot of cases you have to pay upfront and the cost of the ambulance is only covered if a doctor says you need one. Also worth noting that most dentists in france charge a top up fee on top of the state funding.
I have worldwide family travel insurance, European breakdown, family mobile phone insurance all included with my bank account at a cost of £10 a month so £120 a year for all of it and it covers pre existing medical conditions. the breakdown is get you home as well. I think that is very good value.
Richard