Not sure if one is allowed to listen to PMR radios, be it air band, police, fire, ambulance taxi etc. You can listen to CB, Amateur, and PMR466 and broadcast radio, yes I know we do tune in, I listen to local train radio, mainly as a safety thing as working on the line, but technically not legal unless I use their radios, but as long as I don't transmit can't see anyone being worried about it. It would be a grey area since working on the railway.
However
Give them a ring and ask 08081697032
is not really a good idea, interesting it may be, but keep it to yourself. My radio in Mid Wales is dead, I have renewed my licence, why not as now free, has to be validated every 5 years, i.e. you tell them your still alive. You can clearly be doing a scan and in error pick up some PMR radio, but you should not have the freq in your memory.
I remember years ago the Police radio from a Police car in the street came out of my dad's electric organ, so you can some times pick it up in error. Although not today, the radios are designed to stop you listening in now. Even the old mobile phones could be picked up until they went digital. Seem to remember receiving was OK but not acting on the information received.
There was a big fuss about taxi's using CB and thieves using the info gained to know when to rob houses. The same applies today with PMR466, it seems many users are unaware that anyone can listen in, used in shops etc, they often pass on info which they should not.