This is why I would not show my bike, esp speedo in a home movie.
It kinda goes like this
Stopped for speeding or even worse, a routine stop
Officer sees camera, and just needs reasonable grounds to suspect an offence before he reviews/siezes said item.
Then all of your recorded images are evidence your worship, warts and all.
Forgive the following precis, it's actually much longer than shown, but I think you'll get the gist.
Police and Criminal Evidence Act 1984
19 General power of seizure etc. .
(3)The constable may seize anything if he has reasonable grounds for believing— .
(a)that it is evidence in relation to an offence which he is investigating or any other offence; and .
(b)that it is necessary to seize it in order to prevent the evidence being concealed, lost, altered or destroyed. .
(4)The constable may require any information which is [stored in any electronic form] to be produced in a form in which it can be taken away and in which it is visible and legible or from which it can readily be produced in a visible and legible form]if he has reasonable grounds for believing— .
(a)that— .
(i)it is evidence in relation to an offence which he is investigating or any other offence;
Oh and I'd remove the linky to that vid, or infer that it might not have been you at the time
HTH