Median weekly pay for full-time employees in the UK in the year to April 2008 was £479 source:
http://www.statistics.gov.uk/cci/nugget.asp?id=285
£479/week x 52 weeks = £24,908 per year
Therefore I voted "under £25,000".
My thinking is that if they want to get paid more then they will have to raise the median.
If they help everyone else then they will be better off. If everyone else suffers they they will suffer as well.
It is supposedly the principle bhind 'performance related pay' and 'alignment of interests' (eg when company directors are paid in company shares with a delayed period before they can be cashed in - this means that [in theory] if they screw up the company over the medium-to-long term they will also suffer, and vice-versa.)
Arguably you could also build other targets into their pay-scales as well - for example crime, homelessness, pollution rates etc.