Why don't you try betonmarkets or cityodds?
Why don't you try www.betonmarkets.com who offer a much wider range of binary products than IG Index or www.cityodds.com who offer daily range binaries at much tighter spreads than IG.
CityOdds UK give you £100,000 of funny money when you register
CityOdds has a browser-based trading platform for trading daily binary options on a bunch of markets. They give you £100,000 of funny money in a demo account when you register and you don't need to enter a credit card or anything.
Have you tried CityOdds?
Have you tried CityOdds? They offer double-strike binaries on smaller range of underlyings but at consistently better odds and tighter spreads than IG.