O/S arch fettled to perfection. I had to persuade it (hammer) to match the curve profile of the middle panel. I couldn’t work out for the life of me why the panel was bulging and popping when pressed near to the arch. I finally tracked it down to the lip not being bent enough, so when I was clamping it to the inner arch the panel bulged out. Quickly fixed with the trusty hammer again to bend the lip round further and no more popping.

Cut out the previous repair to the rear of the inner arch, which consisted of the original rusty piece sandwiched between two sheets of tacked on metal. I should get this repair welded in tomorrow and make a start on repairing the D pillars.