laying small stakes

Hi all.
I've heard about the 1p lay at a time loophole which carries no liability because of rounding down. Anyone know how to lay medium to large amounts broken into 1p size individual consecutive bets?
 
Thanks

Just to add, it works on odds of less than 1.5. E.G, 1.4 layed for a penny has a 0.4p liability which when rounded down means 0.0p loss.
OK thanks