Vat on services to Republic of Ireland

Hi,

I work for a company which supplies only services.  We are vat registered & supply our services to customers in the republic of ireland.  Some of these customers are vat registered in ireland to which we put 'reverse charge applies' & include their IE vat number, but I have had different advice on what to do with non vat registered customers in ireland, do i charge vat on the service or not?