Preventing Orders From Northern Ireland

[dbltoe]

If you set the zone in a shipping module, no one outside the "zone" will be able to use it so it matters not if someone has already registered as far as their ability to checkout.

You might need to set something else for NI if you have anything able to go there.

[Javier]

It costs but not much relatively speaking. Have a look at the advanced shipping module from CEON. This will allow you to accept orders based on UK postcodes and so let you block NI and even adjust shipping rates to other areas in the UK that have higher delvery costs.

http://dev.ceon.net/web/zen-cart

No connection to the company, just a very satisfied user.