Given that the whole MLA / ILOR set up extends beyond pettyfogging internet wars between opposing factions with a very narrow focus, lifting ones eyes to the horizon might help... 
The CPS submit ILORs in accordance with a set of rules. One is that an ILOR cannot be a fishing expedition much as the cops and others might wish it were.
Another rule is that if what is is being requested is without the laws of the country from which it is being requested then that country may legitimately bounce the request.
Information requested must be necessary and proportional too, which is why the Home Office refused one of the Portuguese requests;
As you know, in considering requests for coercive measures the Secretary of State must consider necessity and proportionality. On the basis of the information before me, the request for evidence relating to Mr McCann's Mastercard accounts for a 6 month period or, at least in the first instance, refine your request to a period immediately prior to and following the day of the alleged sighting, I would be more than happy to look at this part of the request again.
http://www.mccannpjfiles.co.uk/PJ/FRANCES_KENNAH.htm