The P38 is much better at resisting rust than most other Rovers. I've seen LR3s and L322 rust worse. I have three that have seen snow country, and found the following:
00 California for most of its life, New Jersey for a couple years: Spotless underneath
01 Bounced between New Jersey and Florida for most of its life: slight rust on the exhaust flanges and bolts; some corrosion on the bolts and aluminum parts under the hood
02 That spent most of its life in New Jersey and Ohio: some bubbling on the rear wheel wells and bottom of the tailgate; Surface rust on frame, brake lines, most bolts, axles, etc.