Becareful, thanks for the feedback was beginning to think that my chosen username had scared all off! It was only chosen, because all the methods I've come across fall in a heap when subjected.!!!! But on this one, why against IAS,??? (I've never used them so I don't know)

I heard a few negatives about betfair,(on this site) but I presume all is ok there now?? Anyway you seem to have a few of the same thoughts as me about looking at the "failure rate" , as it were" it's a bit different as you are looking for the sels. that probably won't win and then try and back against them. Just for a starting point
lets say, how do pre-post favs. fare say when quoted @ 4-1 or above, with a lousy draw, that havent raced for more than 21 days, finished more than 3.5 lenghts from the winner last start, and don't have awin in there last 4 starts??? thats just a start.