After two years BL cars were showing signs. It wouldn't be tolerated now, and was one of may reasons why the BL Empire crumbled like its cars.
Rust was just a fact of life back then, I'm not sure BL was any worse than most in that respect. I seem to remember having to wield the Plastic Padding on just about every car I owned irrespective of make. In the late 60's/ early 70s Vauxhall had a terrible reputation for rusting cars and of course all the Italian marques would dissolve while waiting for delivery.
~iw