We've never really found a satisfying answer to "162.225 MHz". I know a little about radio, but not much.
One person who might be able to shed some light on this is the guy that produces this YT channel. I've never messaged him, but maybe someone on here wants run it by him and see if he's interested. Maybe he'd even produce a video? In other words, crowdsourcing this might be a way to get somewhere with this 22 year old mystery.
https://www.youtube.com/@RingwayManchester