Hi I am a long way from the rest of you here downunder. When I acquired my RRS S/c it came with 22" rims and tyres. The rims cracked, I brought second hand a set of 2015 rims with Pirelli Scopion 255/55/20 All Season road tyres - very impressed.
More recently I was gearing up for a trip to the outback. I sourced some 19" Snowflake rims (see Seatowns post) because I needed some A/T's for the trip. These fit over the Brembo Brakes on my RRS. After checking what was available decided on some 255/55/19 Pirelli Scopion A/t's . The less aggressive version as I did not intend to go rock climbing. Done over 4000klms on this trip. All sorts of roads ,desert,mud and River crossings.
Could not fault the tyres and as a bonus they are nearly silent. The speedo and the GPS now read the same.  2006 4.2 S/C with Tow Pack, Side Steps, DRL's, 19" & 20" wheels, additional 110 ltr Fuel Tank Roof Rack and performance mods.

1952 Rover 75 (Cyclops) First Car !!! Fond memories -was restored-good for 93mph.