Long term worry maker

Now this next piece has been playing on my mind from the first day i discovered it probably about 2 years ago, pre, i can actually weld era. A small rusty bit surrounded by spot welds high up in the wheel arch, the spot welds being....

the bracket for the hinge for the bootlid, found as you would expect, in the boot.
Now i have no idea why debris and moisture would collect here ( adodgy boot seal?) but it had and rusted through from the inside out. My fears were that i would have to drill the spot welds and take the boot hinge bracket off. I'd been saving this particular job until i had worked up enough faith in my abilities to tackle it. In the end it turned out to be the easiset bit of fabrication so far.

Cut it out.

i found that it was very localised at that i could get a clean edge to weld to without touching a single one of the spot welds. Joy. And i found a nice lump of oddly compacted 40 year old debris.

make a patch. I'll chuck a load of rust proofing down behind the bracket and it should be OK.