Honestly.. I don't know how they go about it but tbh I think all ISP's have to supply info at the request of a high enough authority...
I've posted some commentary in another thread
here and
here.
I don't pretend those comments are the last word in the matter, as I have not been following the developing case law. The important point is that the ISP's involvement is limited to the preparatory
Norwich Pharmacal order stage, where the ability to discuss the merits (or otherwise) of the claims being made against the ISP's customers is somewhat limited.
Golden Eye was something of an exception to explore and develop the limits of the law).
It is also arguable that the ISP's job is not to represent their customers.
Against this background, it is understandable that ISPs often choose not to oppose a
Norwich Pharmacal order application if a court is minded to grant the application.