Given the political correctness of the police and their obsession with identity theft and privacy you'll be lucky to get a reply ~ unless you have demonstrated that Mrs Growler has given written consent for you to act on her behalf.
You may be her husband but she is an adult and the police will not be willing to answer your questions. They would require Mrs G to sign a form of consent before they talked to her solicitor let alone anyone else.
Let it go ~ unless you want to see the car with that registration stopped on a regular basis .... They can and will.
Example ~ My brother works for a firm of wholesale butchers who supply most of the hotels, pubs etc on the Wirral, in Liverpool and Manchester. One van driver got pulled and gave the rozzers some sh*t. He later wrote to them questioning their right to pull him over for no reason. Didn't matter who was driving that vehicle it got pulled at least weekly thereafter until the company owner replaced it.
We'll see if you are right then.
No reply still so far.
What really pisses me off, and I had a long conversation with a traffic rozzer about this at some random show at Chester City FC car park about 4 weeks ago, is the fact that Sunday afternoons on the main drag to N.Walesaround here, are like the friggin' TT races with bikers regulary doing in excess of 100 mph and terrorising the public with their outrageous and downright bloody dangerous riding.
Most evenings also are like wacky races, with the sound of chav mobiles ragging it along the 30 and 40mph restricted A41 through our village.
The sound of these wrecks right on the rev limiter indicate speeds well over the limit on a very regular basis.
Where's the plod while all this is going on ey, where?
Oh yes, trawling along and looking for an 'easy catch' on the virtually deserted Top Chester road, looking for someone driving UNDER the speed limit in a safe and calm manner.
The rozzerette was quite snotty with Mrs G apparently and seemed a tad disappointed that she couldn't nick her for anything, bloody officious bitch.