From a quick look at the pics it does appear to be well sorted with no major rust issues - but more detailed photos of the chassis, including the outriggers & footwells, would be advised. I also highly recommend an in person inspection or PPI by a board member or shop if you're serious about buying. Rovers Down South (George) is down that way.
For me - and this is again just me - the RHD would be a downfall in a Series, but the real killer would be the SIII plastic dash. As I always say, if you want a plastic dash buy a Jeep
. But seriously, a metal dash is where it's at in a Series...I was thinking that just this morning as I was in my '71 IIA barreling down the highway somewhat recklessly in the snow and checking my temp gauge to make sure my radiator muff was doing its job. I just feel like something would have been lost if I was looking down at the hideous monstrosity of a plastic dash that Rover was forced to redesign to meet safety specs with ugly-ass crash pads and the like. Whoops...sorry for the rant