Hi Guys,
I have a TT spacesaver in mine; Fits under the floor, fits on the hub- does all that is required... and cost a fiver. Golf spares will always be cheaper than TT parts, so try looking there! A space-saver is only ever a "Get-you-home" so if it fits, it it will do!
However, a full-size spare with a matching overall diameter is a FAR better choice for "touring" use (even if it is a different wheel size). call it a "space-saver", and (assuming you have a punctured original in the car!) no police-person could possibly have a problem with its' use!
If you follow the advice above, and fit the spare on the rear, the width, tyre brand, and wheel diameter are fairly irrelevant in the short term, but a wrong overall radius MIGHT upset your ABS?
The speed/distance restrictions on a conventional spacesaver would be a major problem on a touring holiday, and since a full-size wheel and tyre are cheaper....Why bother?
ScotAlan