Today i removed the rear subframe ready to add the new one, while i was doing that i checked out the orange dreaded mark on the NS sill which i noticed when i changed the rear spring a few weeks back.
A little prodding and yes for sure it's got the tin worm starting not gone far so hopefully caught it in time.
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Scraped along the sill as you can see from the mark, the rust seems to be local to one area.
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I have just ordered Tom's sill for the NS and have contacted a mobile welder, fingers crossed he's going to be good to fit this sill.
https://www.ebay.co.uk/itm/284325094439