I don't think that UK police will get a section 49 notice just to get some random password because I am pretty sure that the NTAC requires a lot of information

I don't think that UK police will get a section 49 notice just to get some random password because I am pretty sure that the NTAC requires a lot of information proving that they are looking for data that may help preventing future illegal actions or something like that. So I think the police really know what are they looking for when obtaining this warrant.