Information on the percentage of reported personal injury road accidents within Great Britain that had ‘Driver using mobile phone’ recorded as a contributory factor can be found in table 4b of the “Contributory factors to road accidents” article in “Road Casualties Great Britain” at:
http://www.dft.gov.uk/162259/162469/221412/221549/227755/rcgb2006v1.pdf
These data are not available at local authority level and are not available prior to 2005. The contributory factor ‘Driver using mobile phone’ includes ‘hand held’ and ‘hands free’ phones.