Twowayspreads offering zero spreads on popular markets

That does seem a bit too good to be true. Perhaps they are very 'selective' about the prices they return when you execute a buy/sell order?
Or maybe they make some money on the rollover of positions?

They do this to attract more people and they do not hedge these bets. If you start trading larger amounts you start to get refer to dealer and this also happens if you win.  They realise that most people lose and so they do this like a traditional bookmaker and actually make more profit the hedging obviously. No good if you are a serious trader as you cant get anything matched - way to slow.

Thanks jonster.

I suspected that that might be the case.