Just to say that I bought a space saver 19" wheel from The Wheel Shop along. As Stevey noted above, I then stuck several sections of polystyrene using gaffer tape (pic 1) to support the wheel and keep it off the battery cables to the left and right. Enough space underneath the wheel to store the compressor and tyre repair bottle (pic 2) (just in case). This raised the spare wheel but there was still just enough thread available on the centre to allow me to use the normal large plastic nut to hold the spare in place (pic 3). Although the spare was a little higher than normal due to the polystyrene, there's still enough space to allow the top cover to sit flat in the boot. Lastly the tools including jack fit in the plastic tray (pic 4) between the battery and the back of the rear seats (blue towel round them to stop rattling).