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I cannot obtain Betfair SP archives now. Any help please.
Answer: Betfair provides Starting Prices (SP) win and place for GB and Irish horse races. These prices are collated into historical files which go back to 28th May 2008.
The files also provide a range of other aggregated prices in CSV format compatible with most spreadsheet programs.
It should be possible to access them at http://www.betfairpromo.com/betfairsp/prices/