Have to say I was chatting to an owner of an F series at a classic car show a while back, he told me straight re: rust reputation 'rubbish' he said words to the effect of 'I'm not saying they didn't rust, but they weren't any worse than any other car of the time. The doors leaked, because of the dogleg pillars, and you smacked your knee every time you got in/out, that was it, really.
Good engines and box.' Reading up on that same Vauxpedia site you discover there were internal politics between Luton and Detroit which meant that GM 'improved' the design for Vauxhall, and forcibly pulled forward the launch date to the point Vauxhall very simply unable to get the problems they knew were there sorted. The almost universally loved PA Cresta/Velox was made without GM interfering, and was an unqualified success, often called (Chief Designer) David Jones' masterpiece, launched just a short time after the Victor - but with adequate testing and refining of the details.