@Fragarach @neil Is your postcode your data? Yes.
Am I processing it? Yes, to find out where my customers are.
Have you consented specifically to that? No.
Is it necessary for the performance of the contact? No.
Do I have a legal obligation to do this analysis, am saving someone's life, or performing a public task? No.
@Fragarach @neil Is this kind of data processing and analysis what the "legitimate interest" reason is for, rather using it as an excuse to send you marketing emails you don't want or to display you adverts on the internet for things you already bought? Yes.
It would be very hard to argue that I don't have a right to work out where my customers are from and to use that information to make decisions; I have a legitimate interest in it.