It's just part of their policy.
In the additional time it took for Ministry of Sound to follow through with the requested privacy safeguards, BT deleted 20,000 of the records by following their standard operation procedures.
â€œAll such information is automatically deleted from our systems after 90 days in accordance with our data retention policy
This is rich! So BT has a policy of destroying the data over a period of 90 days and The Ministry Of Sound can't actually get the necessary data in that same 90 days.
I just LOVE it when "the system" actually is used to obliterate this kind of usage of kinda the same system!