Does it not depend on the wheel width and the tyre thats being used?   
  
I reckon you could get a 10J ET5 on the back running a 235 with the arch lipped, if not as standard.  And upon checking the ad, those are staggered 8's and 9s', so youd have no issue making them fit. £850 isnt too bad for those wheels either IMHO  
  
235 on the back of a Zed - no thanks. 
  
   235 on the rear of the zed    NOOOO thank you