Spread betting: is a method to trade instruments in the financial markets. You can either go long or sort and your profits will rise depending on the increase or the decrease in that price of the underlying stock price.
Short: gain from market falling
Long: gain from market rising
Spread betting benefits:
Tax free profits
Trade global markets
Profit from rising or falling markets
Leverage your investment returns
some options:
-CMC markets
-City index
-Ig index
-Man Financial
-Odl Securities
dont forget you dont need only a good broker but a platform that can suit your style
Try all the above: open free accounts in all of them