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Betfair provides current back and lay prices for all horses running in today's races at http://www.betfair.com/exchange/horse-racing.
I wish to obtain - on request - a csv file of the best back price and the best lay price (win markets only) for each horse in each race run in GB & Ireland.
These requests will be irregular (i.e. several occasions at different times on some days; none at all on other days), so the software should include a facility to request the data file immediately, based on current exchange prices.