The general terms is exactly the problem with the article Roy. As I said too vague. What applies in the US may not apply in the UK. The footnote regarding fair use is a good example of this. For a photographer to make decisions based on something so vague could get you in a legal mess, though to his credit he does conclude with the statement "Photographers need to know about legal restrictions concerning taking of photographs that include any copyright material, trademark, identifiable person or private affairs." putting the burden of knowledge back on the photographer.
There are plenty of resources in each country that are more tailored to the domestic laws of that country. http://www.photoattorney.com/ is one applicable to US law that I like read from time to time.