Phone, Basically there are a number of these surveys or reports or expert opinions or analysis or whatever you want to call them, they are normally dependant on the bias of the author or the bias of the person quoting whichever article.
Basically the “average” wage of the Country is compared against the “cost of living” of the same.
As Chesters points out, it is obviously apparent that if a Country has a high influx of foreign workers who, generally are prepared to work for less wages then the “average” wage will undoubtedly fall.
If those same people or economic migrants create an increase demand for rental property then the cost of living will rise and statistically the Country’s standard of living will fall.
Interestingly enough most of these reports will place the U.K. above Spain, France, Portugal and Italy.
Again, as Chesters mentions, IF the U.K. is such a crap place to live why do MILLIONS of people from all those superior Countries ACTUALLY CHOOSE to live and work here?
Final point aimed at your own home, most of those comparisons use the USA as the ‘bench mark’ or standard for comparison, I think you would agree that not ALL of your citizens enjoy a standard of living above and beyond every other Country in the World but Mr, Mrs or Ms Average does but they are not representative of any majority.