This function returns urls that allow data to be downloaded from the pages:
http://data.dft.gov.uk/road-accidents-safety-data/road-accidents-safety-data/RoadSafetyData_2015.zip
http://data.dft.gov.uk.s3.amazonaws.com/road-accidents-safety-data/dftRoadSafety_Accidents_2016
Last updated: 22nd Nov 2018.
Files available from the s3 url in the default domain
argument.