The fun has begun

ok so it's been a while since I was last online unfortunately work had me all over me poor disco has been covering England Scotland and wales in aid of work so I've finally got some time to put some effort into my disco removed the rusty rear bumper ready the clean up and install a replacement but like most found the old tin worm been working hard to my rear cross member I'm now wondering do I replace or patch it up opinions please

Looked a little further
I'm surprised the boot it's self not too bad considering seems mostly surface rust