As Polly Toynbee argues in the Guardian today:
'This is essentially a threadbare country with a small cadre of the very rich distorting all averages. The median salary for full-time employees is £34,963. With half the population earning less... [but] Most people have little idea where they stand on the earnings scale... This IFS calculator will tell you your place & every voter should check it, so the rich understand their wealth & the rest understand the injustice'
https://ifs.org.uk/tools_and_resources/where_do_you_fit_in