I belive its Jar3 regulations about ability for single engine operations.
All bo105's going around the end of this year and yes, Wales are currently fundraising to replace all the bolkows with EC 135's. I do know the police in bridgend recently got an ex135 all up cost circa over 4 mil, they have it for 7 years on a ,lease all in at £1000 oper flying hour. Makes me wonder why anyone would wish to actually own it.