It is not on the Bon Coin. I think €2500 was a little ambitious, I just bought mine for that and it is complete, and I have driven it.
He also says they only made LHD cars - there are quite a few RHD cars in the UK. I think the guy is unable to sell it in France and is trying to get at least come cash out of the Brits - with out the CT it can't be registered in the buyers name and I assume cannot be imported and registered in the UK (unless the seller does that first).