All sorted now, many thanks 

Trains run from Paris Montparnasse to Le Mans - the fast TGV ones. You should change at Le Mans onto the slow little train that runs from Le Mans to Tours. If I remember correctly Arnarge is the 1st stop, mand it runs about every hour. (there's also plenty of buses from le Mans bus station through to Arnarge)  

For timetables etc stick SNCF into your search engine, and helpfully the timetables are available in english

Hello,

Space for one 2-man tent for two house trained Northern blokes required, preferably on Maison Blanche or Bleu. No car space required, as will be ditching the car near Arnarge and cycling to the track.

Will only be "resident" Saturday night, as staying for the rest of the week with French friends South of the circuit. Will be at the circuit Thursday evening, and could errect our own tent then.

Happy to oblige with beer, wine croissants etc when we arrive Sat am, and spilt camp pitch cost

MarkDamien