Interesting - work has started blocking ads
As an experiment 2 months ago, I unblocked El Reg, intending to throw a snit-fit if I ran into obnoxious ads. Amazingly, I have not. They've all been well behaved.
However, as of 01-May, work has started blocking ads, resulting in boxes saying:
Access to this site is not permitted by the Acceptable Use Policy.
This website has been explicitly blocked for possible reasons outlined below.
URL Categories: Web Ads
Reputation: Minimal Risk
Code: Global URL Domain BlockList