Noticed the left front wheel arch splash guard was damaged, which was letting water in. The structure behind was all bent out of shape too.
Spent a few hours today straightening it out, removing the corrosion and repainting and resealing, before it got any worse. New splash guard arriving next week.
Complete bodge but should last a wee while longer.
EGR replaced, listers Van Centre in Cov sorted me a nice new caddy 4 auto with only 60 miles on the clock for the last 3 days, it's been a knock and squeek free experience was a bit sad to give it back.