See response from Martyn
"Well yes it is possible to retro-fit, albeit not easily... the heating elements are now a permanent part of the seat covers! so you would need to replace all of your front seat covers. The average cost of all four covers would be about £400+vat. The wiring looms are an integral part of the cars main wiring, so you would need to make your own looms, not as difficult as it sounds, but not for the faint hearted!
The job would be possible, but it's not going to be very straight forward, or cheap really....
I am sorry this is not the answer you probably wanted to hear...."
Answer relates to a 2002 SE with standard cloth seats.
Ian
2002 1.4 Petrol SE, silver with climate control.
Why are NEARLY all the A2s in Lichfield are silver ? ? ?