Map markers show MP Total Claimed Travel Exxpenses over 2007-8 in different bands:
Red: > 25,000
Pink: 20,000-24,999;
Yellow: 15,000-19,999;
Green: 10,000-14,999;
Blue: 5,000-9,999;
Purple: < 4,999;
For more information about this map, including a link to a map that breaks down MPs' travel related expenses (into mileage and railr expenses claims, for example), as as well as links to other visualisations of the MPs' expenses data, see: Visualising MPs’ Expenses Using Scatter Plots, Charts and Maps