You are mistaken on the "option". The tender was for 2 LUH(EC135) and 4 UH,(AB139)with an option for a further 2 UH(AB139). Until the order is placed we will not know for sure if the option is being excercised. If it were the case that we then had 6 AB139s operating with 2 EC135s(which following the retirment of the older Allouettes makes for a rather small heli force),any replacements would have to go through the tender process again,however the tender could specify that parts commonality is required,closing the competition to either Eurocopter or Agusta Bell,Or any company capable of providing us with these aircraft.
Italy recently got into trouble again,when they tried to tender for police helis,and wrote the tender in such a way that only Agusta could offer an aircraft,which it naturally succeeded in winning. The whole thing has now been cancelled,and the authority responsible is being sued by other heli manufacturers.
Its a product of the system in which we live. When using taxpayers money for anything,a transparent purchasing system must be adhered to.