Data on arrests in connection with football matches are collated and reported annually on the basis of club supported and type of offence, rather than geographical location of offence. The data for part (a), therefore, are not collated centrally and could be obtained only at disproportionate cost. The Home Office annually publishes statistics for football-related arrests and football banning orders in England and Wales. These statistics for the football seasons 2003-04 to 2008-09 can be accessed on the Home Office website:
http://www.homeoffice.gov.uk/crime-victims/reducing-crime/football-disorder/index.html
Information in answer to part (b) is presented in the following table.
Football season Football related-arrests in England and Wales Regulated football matches in England and Wales Average arrests per regulated football match 2003-04 3,826 2,433 1.573 2004-05 3,548 2,950 1.203 2005-06 3,274 2,974 1.101 2006-07 3,716 3,088 1.203 2007-08 3,812 3,132 1.217 2008-09 3,734 3,121 1.196