gota go in for a roadworthy on tyre tread due in 3 more days, but im not buying new tyres because i have ordered a set of rims for the car already so il be wasting my money getting new tyres for the original rims. So im just putting my other set of rims from my other car just to pass the roadworthy.

Now my issue is, i have a set of ba GTP copies with +35 offset and my ts50 is staggered offset. Fronts are ok at +35, but the rear sits about 7mm inwards but its hardly noticeable. Is this deemed un-roadworthy running +35 rim on the rears when the correct offset is aprox +28 on the rears?

Out of curiousity why is it staggered offset?

I doubt they will measure unless it is obvious.

has brembos mate

Standard AU offset is +36.5 front and rear, so you'll have no issues with +35 offset and obtaining a roadworthy. The staggered offset on the T3 TS50 wheels has nothing to do with the Brembo brakes.