I've got a loan car from VW just now until my Golf R arrives (hopefully in the next 2 weeks

)
The car is a '59 Golf Plus, and whilst driving home tonight I realised it had Park Assist.
I took a detour via a street full of parked cars to give it a test and it worked an absolute treat! It was the weirdest sensation ever with the steering wheel turning itself - but it got into a fairly small space and pretty close to the kerb.
Can anyone tell me what parts make up Park Assist? I've ordered the front / rear parking sensors, but Park Assist wasn't an option on the UK Golf R, despite being standard on the German one. If it was a cheap retrofit then I'd do it for the comedy factor! A good gimmick to show your friends!