Betfair SPs and comparisons with the industry SPs are available in the results section on the Betfair Racing
Final win and place Betfair Starting Prices for GB and Irish races are available for each day in the files here. These files also provide a range of other aggregated prices. They are provided in comma-separated values (CSV) for each day. This format can be read in most spreadsheet programs. The Betfair SPs are provided for each selection every day. Where there were no backers at SP, an SP of 1001 is shown.
These files contain data from 28th May 2008. SPs prior to this date can be found in this file (size 2Mb).