Would probably go to the previous owner in that case, but you should be able to drop by the local dealers and ask them to check, depending on how helpful they are your other option would be to phone seat UK, if you search on here the numbers been posted a million times, particularly in the sticky thread at the top 'Leon injector Problems' they'll just need the reg plate to tell you if the work has been carried out previously (a lot have been done) or if its still required on that car.