I've been watching practice etc live on TNT Sports at home, that seems to be part of my basic Virgin package but probably isn't widely available.
There's a YouTube channel supposedly showing it live. Search for Grand Premio le mans 2025 live. Currently showing Michelin le Mans cup which I guess is live, here
https://www.youtube.com/watch?v=Ev7q3Onulx0 I don't think you'd need a VPN.
Steve, was your French channel L'Equipe? They have it this year
EDIT: And if your Belgian is any good (or you just want to watch, not listen) try
https://auvio.rtbf.be/categorie/sport-9