I dont know on that, but I have spent a while trading gold futures and spreadbetting on gold. Most of the time lost out. The best i have found were GFT, their futures. but for a while i've moved away from them.
After getting sick of margins calls or position being closed due to the market price temp going the other direction and lthen ater hitting sky high for what i had initially predicted i decided to look for alternative means. I've found BullionVault much reliable and profitable. Basicly you own your own physical gold, located in a vault at a choice of three different locations, London Zurich and New York. So if the price turns against you, who cares... i look at this way "I still have the physical gold" prices (so call promise of pay) will move up and down, but a Killo of gold will alwayz be a Kilo, so i just relax.
The best thing about them is, their prices are near to the spot price, and you can buy or sell the gold in sterling, euro or dollers. So at the same time trade like you would normally. The Customer Service is next to nothing. been with them for 2years now and had no problems.
if that does not suit you try GFTthey have a free trial.
However my advice would be try out atleast Bullion Vault,you even get a free gram of gold.