You could buy Axis Historical, $395 per year, create a system with one rule; TAB no 5, then run it over the past data and then use the Axis Betting Analyser to analyse your bets (for laying) using actual Betfair prices. You could adjust for the Betfair Commission rate you think you will be on as well. Probably take you all of 5 min to do that. Test using flat stakes or proportional laying. As well as that you could analyse your system against about 115 forms/ratings factors to see where the edge is for any ideas you may have. You also get with your yearly subscription access to yesterdays data files so you can test all your systems, methods and ideas and see how they went each day. Its a great research tool and especially for the purposes of laying. In this case if you had Axis Historical already you would have known the answer in less time then it took you to write that post. Is the amount of time you could save worth the $1.08 per day it costs?

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Michal - Ratings2Win Pty Ltd
R2W Axis - Axis is Australia's leading horse racing software and database;
with sophisticated form analysis tools and accurate horse performance ratings for TAB meetings.
http://www.ratings2win.com.au/