O/T: Mountain Rescue
"A good example of this is mountain rescue, when police can drive a TETRA-equipped Land Rover onto a hillside to provide backhaul for the officers involved in the search."
Before it becomes a rumour that Police get their hands dirty in Mountain Rescue work in England and Wales (it's a bit different in Scotland), generally they do not.
There is a volunteer (as in 100% volunteer providing 24x7 cover and having to pay all their own expenses - it costs me about £1000 p/a to be a member) organisation under the umbrella of Mountain Rescue England and Wales who are a 999 emergency service working under the direction of the police who cater for nearly all rural terrain searches and many urban searches as well. They do use some tetra sets especially for ICs and control vehicles but they have allocated frequencies and usually use traditional 2 way radios for all their hill work which also communicate with RAF SAR (while they still exist) and others.