Some internet research shows one edition of that <span class=”biblio_isbn”>ISBN: 9780000178947 (0000178942)</span><span class=”biblio_pub_date”>Publication Date: January 1979 Publisher: Eleri Owen
</span><span class=”biblio_format”>Format: Paperback, 20 pages</span> <span class=”biblio_language”>Language: Welsh Out of Print
</span>
Just some thoughts–maybe one will be one you haven’t tried, since your time is short:
1)Email to Clive Morley Harps — they have a lot of music available for download.
2)Search for Harpists websites on the internet that list that piece in their repertoire, and email them directly.
Hope one of these will be something you haven’t tried.