I was just pointing out how the SB's get thier prices, it's not someone sting there pushing the price around, they take the best bid offer from 5 or more others and because their system recieves so many prices every second it is automated.
TBH i personally feel it wouldn't be cost effective for them to be sitting there all day catching people's stops as that would be quite labour intensive, setting up the system so you're not offering any at the prices you're pushing it down to, then moving the price down 20pts/pips then resetting it, just to nick a couple of £10 per point trades.
Also if they are stop hunting etc, would you not have expected some disgruntled ex-employee to blow the whistle etc, for someone like IG i don't think they'd want the negative publicity that would create, true or not.