Hi Luke,
I've just bought a 2008 Mk2 TTS which doesn't have a space saver spare and I'd like to get one. I've only just joined the owners club and have read your post.
You've suggested using a space saver from a M5 Golf Gti, which due to its width does not fit into the spare wheel well. Is this because there isn't a space saver wheel available for the TT? (I really would like the boot cover to fit correctly).
Any guidance would be useful, thanks.