Yup.....there was no point diving into it with the illusion it would be easy !

First time I tried mine.....it had already had a 1/4 panel, so the lip was strong as fuck, would barely move with any method, even whacking with a huge hammer.

So just decided fuck it, angle grinder out and ripped the entire section of arch out lol. Welded it all back together higher up and then welded a single skin of a repair panel to restore the arch shape again.

At least lots of tyres will fit now without any touching.