Hiya
Yes, the median figure would certainly be a better representation - here, take a look
http://www.empirechronicles.co.uk/2009/07/15/median-salary-of-a-full-time-worker-is-25123So the Median salary in the UK is a smidgeon above £25,000, this is individual and not quite what the OP asked in terms of household income.
Peacemaker - there are plenty and many more people who look to this and other sites when researching a potential move here and financials is one of the very biggest issues. I know you've said in your opinion costs of living and income levels etc are the same or very much the same between the UK and USA and you are entitled to your opinion of course! however much of the independant statistics and reports by all the top end reputable financial specialists show a marked and substantial difference. For the benefit of new people to this site, this topic will be visited many times and is a useful knowledge gaining resource.
Money is something we all have to have in order to live the way we want, it's a very very important factor and many a time allows or restricts many to have their other values too, not just bills!
Cheers DtM! West London & Slough UK!