I saw a high profile case where this happened today and wondered about it.
I understand there probably will (and probably should) be some leeway in this, but if one was arrested for breach of the peace - which under English common law does not require an arrest warrant - could that then be dropped and replaced with another charge that would've required an arrest warrant?
Or, if there is some leeway to do this, can it be challenged? It seems to be, shall we say, convenient that the police are using a power that is given for situations of immediate need in a way that coud be said to circumvent the system somewhat.
Any help or insight much appreciated.