I think you miss the point Weepej.
The police are employed to gather evidence and make sure that evidence is of the highest integrity. They choose not to buy one of the type approved bits of kit. Its like you buying a fake rolex and beig upset that it dosent keep time!
There should be an enquiry as to who is buying all the wrong kit.(with our money) The home office hold a list for god sake, how hard can it be!
When I go to work tommorrow I shall start buying the wrong kit, see what happpens. The guy at the council will buy street lamps from an art student, the doctor will buy pacemakers off ebay, We can have a few high speed train rails from an old redundant coal mine. Bargin meat thermomiters at tesco, Hows anout saving a bit of cash on the suspension bridge. Oh and that airoplane flying over your house has an uncallibrated altometer.
A guy traveing at an unknown speed, was accused of 118mph using some Micky Mouse untested, unaproved , uncallibrated bit of kit.
What speed was he realy doing, How is your crystal ball? My crystal ball caught you at 210mph this morning. How do you plead?

_________________
Speed limit sign radio interview. TV
Snap Unhappy“It has never been the rule in this country – I hope it never will be - that suspected criminal offences must automatically be the subject of prosecution” He added that there should be a prosecution: “wherever it appears that the offence or the circumstances of its commission is or are of such a character that a prosecution in respect thereof is required in the public interest”
This approach has been endorsed by Attorney General ever since 1951. CPS Code