I wish you well with your betting, no doubt you`ve looked into it. But here`s some tips for those that maybe haven`t.
http://www.freewebs.com/lhole/beatthebookies.pdf
I looked into the stats last week but unfortunately can`t find the link, but it went something like - bet £1 on every favourite and in (i think) 1 year you will lose over £1000.