I don't know y they ever put them in new cars tbh when there is room 4 a proper 1
There isn't enough depth in the FD boot well for a full size spare wheel which is ~ 80mm wider than the space saver wheel..
The Premium model with a 17" spare wheel has a false floor fitted to increase the well depth by 100mm which also raises the boot floor height by the same amount. The parts needed for the false floor cost over £300.
NB. The 205/55 x 16 wheel is ~ 20mm less wide than the 225/45 x 17