Sterling last reached the $2 mark in September 1992, just before the "Black Wednesday" crisis, when currency speculators forced the UK government to withdraw the pound from the European Exchange Rate Mechanism.
If the pound does pass the $2 mark, currency experts believe it will be a reflection of the dollar's weakness across the globe.
China has gigantic reserves of foreign currency, much of which is held in dollars.
"Since April there has been more and more comment from Chinese central bank officials about the composition of their reserves," said Mr Derrick.
"There is a definite feeling that they are uncomfortable with their weighting of dollars."
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