I puzzled by this as well. You're right this is not how options really work. I trade options all the time in the US and make money by selling calls on shares I own and selling puts on shares I want to buy. When you sell you should get the premium immediately the option is sold.
J_Bernard appears to be correct. We're not buying and selling options just betting on the option prices. You can't use them sensibly or profitably, so I think we should not bother with them. It appears to me CFDs and spread betting is just that - gambling where the broker wins every time.