inetnums, country origin issues

Hi, I'm new to list so please be patient. I saw a thread dating back to 2003 titled "Change of country enties in the database" and have an issue with country codes. We are in an ISP which serves users in both Northern Ireland and the Republic of Ireland. Our main inetnum /16 has a country code of GB. It seems some of our RoI customers suffer from this regarding redirection of search engines etc. We do have a some degree of address consolidation for PoP's in both countries. Should we have separate inetnum's for these PoP's and get rid of the /16? What is the best way to handle this? Any help appreciated. Mark