I had this issue over a year ago however I have been on vodafone for a couple years, so I don't think BT is solely at fault. Vodafone does use openreach however, which I wouldn't have thought would make a difference but you never know . In the end my problem magically went away after a month or two of having to use a VPN to play LFS.
So I'm not much use in helping find a solution, just my experience with this issue.
yes pls, make it accurate place and time too. maybe we can have red super moons in LFS, and we can actually see them instead of clouds getting in the way like irl!
I'm aware of how race cars behave, in the trailer the cars seem to show no movement at all, not even the small amount you expect from a stiff race car. In the reveal trailer at timestamp 0:58 there are some GT1s in turn 4 at Mosport, a fast downhill left. You would expect some obvious visual movement here even in the stiffest of race cars. These cars are on the edge of grip at high speed, yet to my eye there is no movement.
I haven't driven the sim though, and for all I know that's AI and often AI cars look a bit alien no matter what sim, so I don't want to make any big judgements. I'm just commenting on what I saw.
I hope it looks a little better on release than it does now, the offboard cameras in the trailer make the physics look totally lifeless and artificial.