London is not the only place this type of thing is occurring. You close one door with encryption and someone one will find a way to work around it. Following the emergency service vehicles is not illegal. Technically you could follow a PD unit. I do not recommend it LE gets very touchy when there is a perception of officer safety at risk and an officer seeing you all the time is not going to end well.
Ottawa has a minimum distance where tows have to stay a specified distance from a accident scene. I also know that they log the trucks seen cruising innocently in the area. A stay away zone is a good idea FD and EMS do not need to have to thread the needle to get to or from a scene or worse have some bonehead drive over hoses etc on the off chance they may get a tow. I know that some repairs are in the $4K+ range and that's good money for the body shops and tows need to make a living, too.
One solution is to maybe increase the fine from the current level to $5K. Make it a realistic penalty, not a "you know better get out of here" slap on the wrist.