If you remove the boot floor, then the box section below, then below that the sectioned box with pump and goo, below that you find a wheel well which is partly filled with something on the left. The retaining spigot is there in the centre. More storage space but not for a wheel. The two box sections are as tall as a space saver wheel, so they could have made it possible. They chose not too even though 90% of drivers want a space wheel according to the RAC.