Actually, no - the post from end of August 2008 I was replying to, but didn't realise that till just now
Either way the point was that even though technically it's straightforward to comply with regulation requiring the retention of 90 days worth of data from a collection point of view, the storage of the data is nigh on impossible, unless someone comes up with a REALLY dense storage medium.
Going even more off the original point, my view is that if the government wants stuff intercepted then it should damn well have to go to a court to get it organised. Random trawling is ineffectual, the cost falls eventually on the consumer rather than those who want the data in the first place, and the potential for abuse is rife.