Park Assist...

[VmW]

i did not check but it would have been difficult to align if the cars at the fornt and back are not aligned.  It does seem to detect the kerbs, though.  And like I wrote in my earlier post, the car was aligned with the kerb.  Must try this one more time with poorly aligned cars just to be sure.

[Snoopy]

When i tried it out it did seem to want quite a large gap to get into. Maybe they have made it better since.

[p3eps]

Ah well... if its an expensive retro fit then I'll definately give it a miss.
I had hoped that it would use my current sensors and just need a module and some coding or something.
I'd probably only use it a handful of times... so I'll maybe just play with the demo one in the next week or two until I get bored of it