As you say, Tony, fraud is criminal. What the company did was contrary to chunks of the Code de la Consommation, but on the subject of involving the police - do you think they would believe us? See what you think. After being pressed for months on whether timber frame timber was really properly treated NF EN335 Class 2, it issued 3 'attestations de conformite' certifying that the more than 1 mile of timber we had bought was treated. Unfortunately, they didn't quite get the story straight because they claimed it was the bright yellow treatment they'd used.... our wood was nice and blonde! 3 days later they admitted most of it wasn't treated at all, but only after I insisted on an independent lab test - shame they didn't read their own internal paperwork when we first asked. What has caused us the major problem is that most of the wood was then the load bearing structure of our house. The firm brought in to try and retrospectively treat the wood has caused more damage to the existing building - around 14k of euros! The saga has not reflected well on what is supposed to be a very reputable company and now you know why we are looking to take this further. There is no question of misunderstanding of what the treatment should have been or what the timber should have been used for - my partner has been in timber frame construction for 30+ years and the nationally-available 'Batimob' timber frame system offered the right kind of wood for the job. While I might not be fluent, my French is good enough, but I've had to learn a whole lot of vocab I'd rather not know!