Hey mate,
From what i can work out, if you don't have MFSW, you'll need a new steering wheel controller, and it'll need to be coded.
If you don't have MFSW, and you buy a mk6 non-MFSW, it'll bolt right on (if you get the correct airbag loom - I didn't, neither did Colin). Just make sure you insist the seller sells you the correct loom for Non-MFSW!