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dont believe all you read. Posts complaining about price manipulation are generally from disgruntled clients who lose money. If a Spread Betting company posts a manipulated price you can complain to the Ombudsman about it. The unpalatable fact for many clients is that when they lose they lose to the person quoting the pice (i.e the Spread Betting Company) somehow losing to the market maker rather than to a third party on an exchange seems to really annoy some traders. In reality it makes no odds. If you lose then you lose, worrying about WHO you lost to is irrelevant.
I had a exchange price comparitor working on one of my systems versus Capital Spreads and the price on CS never deviated by as much as half a pip from the technical exchange derived price. IG do tend to bias the price in indices markets
to reflect their book (i.e if the majority the clients are long in the FTSE they may push their price higher to try to tempt sellers) but I have never seen any sudden variation which would indicate a stop hunting expedition.