So people use contracts for differences to do short term speculation in stocks, not physical purchases: moving to another legal structure rather than another legal jurisdiction if you like.

FORBES: Wolfgang Sch?uble Asks for the Worst of all Possible Worlds

In short he noted that the spread betting companies offered contracts for differences (not unlike an option but a gambling contract, not an option itself) based upon the best bid and offer prices on the London Stock Exchange.

FORBES: Barnett Alexander's Market Abuse: Wait, What Market Abuse?