Section 19 PACE 1984 allows the Police to seize evidence of an offence on 'premises'.
Common Law allows seizure of evidence for indictable or either way offences. Speeding is a summary offence so that is discounted (That nugget came off a forum so I cant say with certainty but I've no reason to contradict it)
There's a whole load of debate on the definition of 'premises'. For the purpose of Stop Search (Sec 1 PACE) a vehicle is deemed to be 'premises'. But for other offences it is not. So a warrant is not required to open a car door and arrest someone.
I think it is a matter of proportionality. If the speed was catagorised as dangerous or the driver was involved in a serious accident then it could be justified. There seems to be a good deal of different interpretations which doesn't help
Having said all that I don't thing there is a black or white answer. Similar to driver using mobile phones who dispute the offence. Could they have their phone seized and analysed?
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