Now, "ask" or "request" are odd phrases to use in any law, and I have encountered legislation that uses it before. The PECR section 32 where I "may request" that the ICO take enforcement action - but you can request all you like and they have confirmed that the law does not "require" them to even consider your request. Obviously merely asking someone to do something does not, in itself convey any duty or requirement on them to actually do it, even if asked by a policeman! So just delete that clause surely!
However, it is not so simple, as section 50(2) says "It is the duty of a telecommunications operator who is obtaining or disclosing communications data, in response to a request or requirement for the data in pursuance of an authorisation, to obtain or disclose the data in a way that minimises the amount of data that needs to be processed for the purpose concerned." Now this is tricky as it seems to be simply saying you only minimise the data you get, but it sort also says you have a duty to actually "obtain" the data even if just "requested" to get it rather than being a "requirement" (as per other sections). So it sort of gives "ask" some power all of a sudden! [update: as someone points out, this is only those "obtaining" or "disclosing" so is not forcing one to "obtain" if "asked", even so, see below that you can be "required" to obtain data anyway]
Also section 66 says "It is an offence for a telecommunications operator, or any person employed for the purposes of the business of a telecommunications operator, to disclose, without reasonable excuse, to any person the existence ..." so you have to keep the request quiet.
Also section 65 makes this lawful, well, maybe. It makes the "asking" lawful, and anything you have to do as a "requirement", but does not actually make lawful the complying when simply "asked" to do something, even if you have a duty to comply!
But that is only "telecommunications operators", right? Well, yes, and sort of no. 193(10) defines that as anyone that "offers or provides a telecommunications service to persons in the United Kingdom"but goes on in (11) with "“Telecommunications service” means any service that consists in the provision of access to, and of facilities for making use of, any telecommunication system (whether or not one provided by the person providing the service).". Note the lack of "public" in the provision, so anyone that merely "facilitates" the making use of a telecommunications system to others, even if not for profit, not part of a business and even if not to the public, is a "telecommunications operator". that means that even if you just pay the bill for your family's broadband you are a "telecommunications operator" and could be "asked" to do stuff by the police, secretly, even if what you are asked to do is illegal.
Note that 46(40)(d) allows an authorised officer to "require" a telecommunications operator obtain data, and 50(1) makes it a duty to comply, so anyone who is deemed a "telecommunications operator" can be ordered to do anything necessary to obtain communications data from anyone by any means, and 65 makes it lawful.
So police can order people to do things, such things are deemed lawful regardless, and they have to be kept secret.
What a lovely country we all live in. I may have to move.