One you seem to miss the point about depressed wages spectacularly; average figures never truly represent anything, they are inherently inaccurate due to being averaged. The London/south east figures skew the overall average upwards
The median average UK salary is currently £27,531 while the City of London is the highest-earning region, boasting an average salary of £48,023. Read more: http://metro.co.uk/2015/11/18/how-does-your-salary-compare-with-the-rest-of-the-country-5511194/#ixzz4fd4gYzlS
Figures from the Office of National Statistics (ONS) show that the North East was the worst paid region in the UK in 2013 with an average salary of £24,084. In London pay is £35,238 a year, and the UK average is £27,017
In order to achieve these averages, some workers will earn an average of say £100k, and others around £12k - guess which regions get the higher figure?
Average north west house prices are around £180k against a UK average of £218k, but that will be of little comfort to the struggling first time buyers in London having to look at average prices of nearly £500k.
That's why average figures really don't affect voters in the way that the experts would like them to.