Here is a quote, which, I trust, some of you will possibly find interesting, from Silvani's acclaimed "Beat The Forex Dealer", where he is not exactly alluding to spread betting but moreover to the retail FX market:
"Does stop hunting really take place?
Of course it does! Dealers are as much information pedlars as they are price quoters... Stop hunting takes place all day, every day, and there are some prop desks that actually specialize in hunting for stops for short term gains. Sometimes no communication is needed, since dealers know that Joe Trader places his stops at obvious levels that they become perfect targets.
It's amusing to see that most brokers actively preach to their clients the value of placing tight stops as a way to control risk, but in reality they are just looking for stop levels to shoot for. Tight stops more often hurt the trader than they help him, since the intra day FX market is filled with random moves (noise) that routinely wipe out the retail crowd's 10 pip stops."