Nissan Primera P11-144 What to do with it?

Sad to hear your woes, never knew that a Primera as modern as a 144 would have that much excessive rust, must be some pretty hash salt on the roads around Brummieland. Nether-the-less, there's nothing wrong with a Mondeo, just aslong as it's a good example (FSH is a must), even if it's a bit boring. Also from what I recall, you are correct. Apparently when the P10 hit the market, it shook up the car industry and very few saloons at the time were considerd "driver's" cars, that is one's that wernt made into them via a 'Sports' line or the elite German Panzer-'loons.
The Mondeo was a huge leap for Ford from the Sierra and it's kind-of the same story for Vauxhall's Vectra and many other rivals. I still think it took another generation or two before it had a real rival however...

I had a '51 Accord before I went back to a P10 and I can honestly say that both cars are excellent in terms of driving position and handling. The P10 is a little sharper steering and better on country roads and the Accord surpassing the P10 in terms of refinement and performance (at a big cost of MPG sadly).

Hope the Mondeo works out well for you anyway!

Just out of interest had the car ever been under sealed?

The car seems to have the factory applied underseal, but parts of the rear floor and chassis box sections are almost rusted thru. I can feel the thinness with my fingers - dare not try a screwdriver!  My previous S reg Primera 1.6 is still going with 200K odd on the clock and not a square centimetre of rust anywhere. Just must have been unlucky with the P11-144. Engine's really good and quite nippy only done 106K, no smoke or losing oil, and was hoping the car would have lasted another 6 years or so......alas, not to be.