Our
Ibiza 1.4 SC also suffered this
problem after being left for 4 days. AA called out and jump started and OK since.
It is a 59 plate, Sept 59. Also had a previous
problem when the immobiliser activated. Again called out Seat Assistance and the guy told my son that the indicator on top of the battery showed immobiliser had activated.
He jump started it, and locked/unlocked the door again I think to reset it.
Should have written down what he did.
I wonder if Seat will be recalling our car for the BCM fault - it was in not long ago for recalls but I do not think that was one of them. Edited to add it was definitely not recalled for this update - was the gearstick cover and airbag recalls it was in for.