Data retention directive "invalid"

[Peter Fairbrother]

eg: 
http://www.reuters.com/article/2014/04/08/us-eu-data-ruling-idUSBREA370F02014040

http://www.theregister.co.uk/2014/04/08/european_court_of_justice_says_data_retention_directive_is_invalid/

http://www.bbc.co.uk/news/world-europe-26935096


Can anyone help explain what this means?


As I understand it, the directive was implemented in the UK except 
through the The Data Retention (EC Directive) Regulations 2009 (which 
for instance, unlike the Directive, does not require the deletion of the 
data at the end of the retention period).

Anyway, do any ISP types want to say what sort of data was/is in fact 
retained, and whether they got reimbursed for retaining it? Particularly 
in regards to email and internet access.



Would it be legal for an ISP to delete all it's retained data today?


-- Peter Fairbrother