Tyre pressures - all bang on.
I'd probably be less concerned about this if it wasn't for the well-documented Roadster sump clearance issue - with particular bias to the offside. Although the "sag" is currently worse at the rear, if it were to continue, it could only exacerbate the risk of punching a hole in the sump sooner or later

Interesting analysis of the effect of engine rotational forces Dave - thanks for that - I've certainly seen the effect in several cars with big North-South power plants I've owned over the years, as a momentary lurch on engine acceleration - especially at rest - but I've never heard of it having a permanent effect!
Think I'll get Berrybrook to take a look - one way or t'other. As there's another year of warranty to go, it would be as well to at least register my concern, doncha think?