Heated seats were an option on the
Ibiza, you can buy the dash insert below the climate control with the switches in.
I think Guinness posted the ETKA drawing in another thread about heated seats recently.
Thanks to whoever posted the link for the VW retrofit kit; after writing the
Ibiza off I'm going back to a Passat again but this one hasn't got the heated seats. So I'm quite tempted to get one of those kits...