"Domestic add-ons can be used while roaming in the EU from 13th June. See Table 3 for more information."
"Guido Membership domestic add-ons purchased on or after 13th June will also be available to use in the Republic of Ireland and while roaming in the EU from 13th June. Domestic add-ons purchased before 13th June will be available for use in the EU after your first membership purchase from 13th June"
Hope this helps.