so that leads me to today..
got a bit bored so went and visited the car to see if i could make it all work out.
managed to squeeze the 15's in whilst running the 13" wheel setup
had to wind the castor back as far as the bar would allow but they just just just get in there.
and believe me or not that actually turn too....... without touching anywhere
fill the guards nicely too
so finally i have the 15's sitting in the guards where i wanted them, nice and wide and low, and have a decent size wheel and tyre under the car too.