Why was there any relation to short selling regulation as a lesson learned from the trade in question? Wasn't it more about the policies of the U.K. leading up

Why was there any relation to short selling regulation as a lesson learned from the trade in question? Wasn't it more about the policies of the U.K. leading up to the trading opportunity, rather than any abuse of 'short-selling'. (Plus given it was currency markets, rather than stock markets...)