Well I did a bit of reading (as opposed to working on my coursework, but meh

) and the UK Ibizas definitely had them as an option. Although, two (pairs) of things would be needed...technically three, but I'll get onto that later.
First of all the wing mirrors themselves. Not sure even though they share the same platform, the Ibiza mirrors would be a direct fit onto the Polo body. The motors that fold the mirrors are in the mirrors themselves (duh), but the mirror housings are the same for electrically folding and manual folding mirrors (On the Golf that is, I'm working on the assumption that this holds true for all models). So potentially you may be able to just swap the guts out of the Ibiza mirrors into the Polo housing and use your existing mirror glass

Also, the electrically folding mirrors also have a microswitch in them to "tell" the mirrors when to stop folding. Again, this shouldn't be hard to get around.
Secondly (the harder bit), the mirrors themselves do not have any electronics (logic) in them and the motors in the mirrors are controlled by the electronics in the electric window motors. The window motors are different for cars without electrically folding mirrors and cars which do have them. Externally they look the same, the difference is not in the motor, but the circuit board. And these have been swapped over into the "lesser" motors on Golfs and worked fine in this application.
Finally, there's a bit of wiring that needs to be done, but once the first two steps are done, this'd be a piece of cake. Then you need to change a few settings in VAG-COM and presto.
Not sure how much it'd work out at (electrically folding mirrors can be had for ~£50 new a side of the bay; then you need the window motors and the switch). Could potentially end up at over £250. Not sure it's worth it from a financial point of view, but it'd be cool
Might look further into this when I've got some free time over summer.
Ash
