Std psi plus 2 - only because I lost 1.5 mpg when i fitted them, the slightly increased pressure brought the mpg back. The noise was more pronounced in the first 1500 miles then quietend once the tread had settled in - these are 11mm deep when new.

Mine came with Nexen's on the rear - 255 50 20's, had about 6.5mm of tread on them when it arrived. I've so far done 29,000 miles and there is still 2.5mm of tread although they will be changed in the next couple of weeks.

I bought a job lot of Scorpions recently when the fronts needed done (they were Dunlops), so I have 2 Scorpions left to go on the rear. When they are done I'll definitely consider Nexens on the rear again. Current Fleet:-
2018 Discovery 5 3.0 HSE
2021 Ford Ranger Wildtrack
2019 Ford Mustang Bullitt 5.0 V8
1993 Defender 90 200TDI Pickup

Gone - not forgotten
2016 L405 4.4 SDV8 Vogue SE
2012 L322 4.4 Westminster
2004 L322 4.4 V8 Autobiography LE
2000 P38 RR 4.0 HSE (ex Clarkson test car)