Been looking at this for a while. Basically it works on the fact that newspaper horse racing selection come out the evening before a horse race. On the following day (the day of the race) you get all of the mug punters betting on the newspaper tips. As they do the odds fall. If you back the night before and lay 10% less (so that its taken the next day) then you lock in a nice profit. It doenst always happen but by keeping an eye on the odds and accepting the odd loss (laying at a higher than optimum odds), Ive managed to make a tidy little addition to my growing sum !
Have been given the permission to share the tips provided by www.cash-matters.com

 Its a bit late but todays tip is MUSSELBURGH, 6.50pm, Ice Trooper.

Ill keep the tips coming so see what you think

Here's tomorrows ..... Its Fear Northing, 2.15 at Wolves.

I'll post these each day for a week or so to see if people are interested to test the water.

Tomorrows Tip is Theres No Panic, 3.15 Newton Abbot. Current odds at BF are 1.55

Tuesdays tip dropped from 1.55 to 1.4 at its lowest. Not bad I suppose.

Tomorrows is Winters Night at Goodwood. Its the 4.55
current odds of 1.9

It was still 1.9 at BF up till 2am, with hardly anything matched. But i was also on betdaq, looking to use my freebet, and there was over £200 available at 2.0, with over £20,000 matched on the race ? So out of interest i went onto every race for today, and even though the market wasn't properly formed, they all had + £18,000 already matched. So do Betdaq put money in, to get the market started ?

So anyway if anybody's following this overnight trading, look at betdaq, because there's never any liquidity on betfair, round midnight, when i'm skulking about !

Todays tip dropped to 1.62 before the race and the horse went on to win.

Tomorrows tip is 4.40 at Nottingham and the horse is Forest Runner

Current odds at BF are 1.5

Jethro - interesting about Betdaq !

OK, eyes down for a new week ! Here's Mondays tip .... Advertisement, Wolves at 2.45. Current back odds of 1.55

Brilliant! Backing at somewhere like bet365 could be more profitable? The odds dropped to 1.25 5 mins before the off, so easily made 10% on this one.

One for Weds its the 5.40 at Hereford and we suggest Destiny's Dancer. Current BF odds of 1.60

The odds of todays horse dropped down to 1.43 so yet another win. Tomorrows is Penyfan Dawn at Fontwell. Starts at 5.20. Current odds of 1.99.