When did they change - they used to base stops on the underlying market.
If they definitely said that, then fair enough; I stand corrected.
I googled around looking for some definitive statements (from any SB firm) and could not find it in terms of stops. Most references to underlying market were to spreads,
for example this from Capital Spreads:
"We make a spread around the live, underlying market price and you can bet on whether this market will rise or fall. "
"We make our profit from the spread we add to the underlying market prices, which result in our quotes."
http://www.capitalspreads.com/public/whatis.shtml
http://www.financial-spread-betting.com/Stop-orders.html
Q. Are there any companies that allow me to use the market prices to trigger the stop and limit orders, which would then transact at the firms prices?
I'm quite happy using spread betting as my main trading instrument for the time being, and have slowly but surely made money in my first year of trading, but if I could use market prices to trigger the stop and limit orders, which would then transact at the firms prices, it would make my job of automating my trading whilst I'm at work a whole lot easier.
A: Yes, some do offer market price but I'm not sure which although I think Man do even though I believe only on daily cash prices.
"Market Price Order Orders can be left on a market basis. This means that if the underlying market triggers your order, you will be filled on our current quote."
But who knows?
Maybe your best bet is to email their helpdesk and ask them.