here you go:
http://www.timesonline.co.uk/tol/news/uk/article2500754.ece
Beginning of article:
"The richer people become the further they cycle, according to official figures overturning conventional wisdom that the bicycle is largely a poor man’s mode of transport.
The richest fifth of the population cycle on average 2½ times as far in a year as the poorest fifth.
The Department for Transport’s National Travel Survey indicates that the poorest fifth, despite being five times less likely to have access to a car, are very unlikely to consider cycling as a solution to their transport needs."