We also are affected by the LGV line mentioned, but will be to a lesser degree, and the landscaping planned has already been implemented in parts here near Chaunay 86, and more to follow, and it seems a very extensive and well-thought out choice of indigenous species...
We purchased having been told nothing by the imo about the close line planned at the time, but found out the day the Compromis was due to run out...we re-visited the area and saw for ourselves the red-topped sticks in place by then, showing the planned route. When tackled the imo blustered and admitted the farmhouse (where he grew up, we discovered later!) would be 4kms from the line...it is actually 1 1/2 kms, but we guaged it acceptable and went ahead with the purchase, with no price reduction requested.
Then all the works started, and the sheer scale of the project kicked in. The line is much wider than we had thought, and then after the planned cutting it was going into had to be raised 8-10' because of the water table, so that it barely enables the electricity lines now to pass under the newly-constructed bridge, we really thought it would blight us all. Mud walls/barriers have gone in, and we've been told by pals that the trains will be making less journeys than we had initially thought.
In this time from purchase nearly 6 years ago, we then found ourselves having to move and downsize, but really concerned at the hit on our house -price...When a smaller but charming little place came up last year very cheaply in our hamlet, we decided to buy (we love it here and our neighbours) and hoped for the best when ready to market our main home....Be heartened! We chose one imo only, and went on the market less than 2 weeks ago, and received a good offer from the first viewer (of 2 with 2 more lined up) within days, which we've accepted. The question of the line wasn't raised at all, despite it being obvious and on the way to our village. We seem to find here that windfarms are the burning issue for many, as they seem to be popping up all over the place.