Lol. Yes, I do like ham
Sorry for the late reply. Getting married really takes up a lot of time!
Ok, here we go...
1. It is illegal to listen to any thing that you do not have a licence for. This includes everything apart from commercial AM/FM/DAB radio and some licence free frequencies. You can not even listen to the marine band unless you have a marine radio licence. That said, there is no pratical of detecting illegal listening (there is a way but its a bit OT for here). From an emergency services standpoint, the system in use is powered by the 02/BT network and not Motorola. Motorola make some of the handheld radios so do Nokia. The system is called Airwave and it uses the TETRA network for secure comms. It is fully digital and every radio device has to register on the network before it can hear the chatter. It is currently 100% secure and the penalties in place for attempting to hack it will mean that it will remain secure for a long time (unless you want to be tried as a terrorist!).
2. See above. I can recommend a few good scanners and some fun stuff to listen to if your interested.
3. There are a ton of cheep Chinese VHF/UHF handhelds on the market BUT, if you are interested in comms, even for emergency only I STRONGLY urge you to do your ham foundation licence. It will give you a basic understanding of radio, propagation, bands, and operating procedures. It will also allow you to legally use the radio that you may buy and help you become a better operator. Many people will go out and buy a simple handheld radio for emergency comms but fail the first time they try to use it in an emergency due to lack of practice.
F.Y.I. - My emergency comms gear shapes up like this...
Yaesu FT857 with a custom build frame that holds a 7ah SLAB. Good for 4 hours at normal use with 50W output.
SGC 211 ATU and a selection of lengths of wire and coax.
A dipole antenna made from 2 telescopic stereo antennas.
A small SWR meter
Those items give me the ability to communicate around the world from any location. I have a bunch of other gear in my radio bag that allows me to do things like set up a local, secure comms network that unlicensed users can legally use. Maybe I could do a post about it?