However, I think the one thing I need to finish the look of my car of is to have wheel which sit right out to the arch, widening the broken suspension look.
Currently wheels sit about an inch inside the arch, as you can just about see in this pic:

If I were to look for a new set of rims, what offset/width would I need to get the broken suspension look I'm after?
Something like Si_Import has:

Although his fronts are probably slightly too wide, as I'm not a fan of the stretched tyre look.