Hi Bolkow.
The UH-12, EI-AKT, was registered to a company called "Irish Helicopters" who were based in Shannon in the late fifties. The guys at IHL tell me that that was a completely different company to the current "Irish Helicopters Ltd" which first started operations in 1968 in Dublin. Another source has also confirmed this. Irish Helicopters Ltd operated a green and white Fairchild-Hiler FH1100, EI-ART, that was leased to them from a company called "Bandwagon Ltd". I don't know who they were but, at a guess, might have been something to do with a showband, who were popular in Ireland at the time. Thanks.
500 Fan.
Edit: Just found this photo of EI-ART.
Photos: Fairchild Hiller FH-1100 Aircraft Pictures | Airliners.net