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We considered fitting a winch to our EC135 in 1997. So too did Dyfed Powys. Problem then was the CAA. They wanted to make the police officer a crew man with associated paperwork, medicals, FDP limits, log books etc!!
Eventually we were overtaken by events, in that it was discovered very soon that the EC135 in police role can't comply with CAA perf requirements to hover on 1 engine while winching. There were performance issues during training and the coup de grace was: weight and Cof G issues. A non starter I'm afraid for Uk police Ops. You'll need an EC145 and police observer crewpersons, I'm afraid.