The full Savills report (http://pdf.euro.savills.co.uk/global-research/tech-cities-2017.pdf) doesn't really mention how they selected the "top 22 cities", only how the cities they selected rank comparatively and the metrics they used to differentiate them. A cynic might be inclined to think that a "property consultancy" is mostly interested in pitching cities they have active property in.

Since one of the advantages of "tech" (let's just call them software startups) is the possibility of remote working, maybe the answer to the "top 22 cities" to do tech in is - the one you live and work in already?

On one hand, it's silly to project morality on any public audience. This doesn't directly have anything to do with the UK government (summary is misleading), as this appears to be a unilateral decision made by Sky. On the other hand, IF one assumes that porn sites are more likely to carry malware than others, I can see the utility for blocking these by default. In the case they're blocked, I assume the landing page will easily provide access to an authenticated page that will allow a user to change their preferences.

This isn't much different to my thinking from Google Images turning "safe search" on by default. In the context of security issues, it's similar also to blocking SPAM or viruses coming in from email by default; a provider should allow this content to traverse if desired, but by default, shouldn't. The obvious difference outside of security concerns is that porn is content that a customer may very well want to receive.

Potential for abuse on the blacklist is going to be high. If I want to learn about vaginas, should that information be blocked?