Cheers.

PCD on these wheels is 4x100 so no adaptors needed. There's a 1mm diameter difference on the centre bore so there's 0.5mm gap all the way round but that's no big deal. Ideally you should use a spigot ring to shim up, but nobody makes 1mm spigot rings.

I did my research and since Rovers are 4x100 as well (quelle surprise?) I found out that quite a few Rover fanboys have been using VW wheels with no hassle or trouble.

Tom@1320 also told me to not worry about it.