Thanks for that link snowyb. When at the hse.ie website, do a search in the top right, key in 'treatment' and it will suggest 'treatment abroad'. Click on the second suggested doc for the comparison referred to above. However, it seems that the hse page has not been updated for the latest EU directive as it refers to the former E112.
The new scheme provides for re-imbursement up to the level that would apply in the public system here, i.e. the accepted cost of the procedure, or has been approved for similar procedures abroad, less the €75 per night charge levied here. Travel and accommodation expenses at own exspense. The former Treatment Abroad scheme did not allow self-referral whereas my reading of news articles on the latest EU directive suggest that self-referral is now acceptable under the latest scheme.