Jack,
Its nothing to do with spread betting, you are just using 2 spread firms to ascertain a price. Firstly 2 things, I have a deep laid hatred for losing money to books due to years of misery, so I can go forever without a bet rather than give them any easy touch, only when I think I am beating their price do I put my head out of my shell. Secondly, I have long given up trying to be a judge at certain sports, soccer being one of them. These 2 firms put big money down on every game so their opinion is good enough for me.
If you take the Southampton game Monday, they are going 2.5 goals. On my template that means in the U/O 1.5 goals market, the under should be 3.4, the over 1.4, in the U/O 2.5 goals market the under should be 1.8 and the over 2.25. A quick look at Betfair suggests the value, although slight is in the over, however, I would have to get at least 2.3 to have a bet. As you probably know, different Countries do not have the same scoring levels, so different templates are needed.:drink: