I thought I would give you all a quick update. I am still working on protecting the underneath and eventually managed to find a day free to get stuck in with the Dinitrol protection. I got the mud flap and front arch liners off to check for any areas where corrosion had started, rubbed it right back to clean metal, used RC900 to convert any rust, and then put new underslea on (Dinitrol 4941 I believe). I also used Dinitrol ML cavity wax in the sills etc.

So far so good. I haven't found anything that worrying, just the middle "hole" in the mud flaps that had corroded away, but I am sure it will be happy enough with just 2 fixings anyway (can you still buy these new??).

The rain was falling sporadically so I couldn't spend the whole day out there, but I have done one whole side and most of the small areas that needed touching up on the underneath.
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Rear arch:
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Front arch:
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More to do when I get another half day spare!

Rich