Spreadbetting 2005

A question for the experts?
I have noticed that some shares show quite wide SP range during quiet days, such that it would appear a limit order left to buy below the 'normal' SP or sell when above might give an opportunity for a few quick points or at the very least a 'free trade'.
Now the question, does the Spread Bet comp's quote follow the SP during the breif highs and lows that may occur. For example Finspreads offer limits/stops at their quote or market price, what happens if an order executes based on market price set well below/above the 'normal' range? Does the SB company quote generally generally follow the SP (ignoring the effect of other bets with the SB co' which may already be reflected in their quote) or do they just smooth the glitch out so you end up getting filled at the 'normal' price?

A very Happy and Prosperous New Year to all.