I'll pre-empt my local area member Lawrence on this one (sorry Lawrence!!) - suspect everything between the bumpers. Then include the bumpers.    If you've already got an MG or two you'll know all about British steel - great if well looked after but a tendency to rot everywhere if ignored. The chassis is obviously the main area of concern, especially the dip around the differential / rear axle - check the inside of each rail and poke it hard with a screwdriver or other prod. Repair sections ar