actually they have two bolkows, EI-BLD and EI-LIT which was acquired around 1996 with 4000 airframe hours on it (ex-poilce from Quatar I think.)
EI-BLD has as you say in the region of 16000 hours on it now, and EI-LIT ( a stretched one) has in the region of 10000 hours done. Apparently both will be replaced in the not too distant future as the lighthouse authority plan to acquire their own in house EC 135 helicopter for offshore lighthouse work.