Re: How much?
Unfortunately Pye, and it's more recent incarnation as Philips Radio Systems, are no more.
Also long gone is the procurement that was driven by well qualified and experienced radio engineers in the HO.
There are many stories about Airwave usage being charged per minute to Police Forces with huge airtime bills having to be paid in the past. Police officers have told me how they were encouraged to use PTT as little as possible on their Airwave terminals to save the Force money!
Commercialism gone too far