Older vehicles are insurance write offs if the cost of the repair exceeds their market value.
Of course, but on an older car that may have little to do with being scrapped. A car may still be 100% roadworthy and usable with minor cosmetic panel damage that insurance would never pay to fix. We had an old Mini Clubman that got lightly shunted from behind. Broken light cluster and bent bootlid - insurance write off. Bootlid from a scrap yard plus a rear light cluster - an hour's simple DIY and it was good as new.
Our 2007 Vito van (incidentally, the most expensive vehicle I've ever bought!) has collected a few bodywork dings over the years that would cumulatively almost certainly write it off if dealt with by insurance.