I’ll definitely be looking for an excuse to take another trip, out of St Pancras, sometime after November. Lunch in Paris, perhaps.
I found a website, TGVWeb and with a lot of detail about TGVs, and it has a page on the TGV’s relative, the Washington-Boston Acela. Now I know that’s not on your doorstep, but it’s maybe closer than Ashford.
There are also some pages on failed American TGV projects, perhaps closer to you, as well.