Hi there,
You may search cars as a category, that is "Automobiles, utilitaires", but you'll get thousands of items to view. Best is to enter a car's type, let's say "Ford Mondeo" in the "Automobiles, utilitaires" category and then select a kind of engine/body or a year of making or max mileage so as to narrow your search.
Do not forget that cars around here have the wheel on the wrong side, speedo is in kilometers and you'll have to pay V.A.T. on both the price of the car and shipping if you take it back to Brittain.
Unless you're after a vintage or exclusive model, you must consider if it's worth it.
Maybe you just want a car to drive when in France and this is not my business, just don't pull to the left when I am facing you ;o)
In any case, you must have it M.O.Tested or go through a "Controle Technique" and have it insured before putting it on the road unless you have it shipped.
Last but not least, type your search in French, there is no thing like a sedan or estate here, only "berline" or "break", and no Vauxhall, only Opel.
Good luck !