Bonds, equities and the pound are heading towards a "catastrophe", according to technical analysis by Charles Nenner, founder and head of research of the Charles Nenner Research Center which focuses on the cycle analysis of markets.
Sterling has been one of the worst performers of 2013, falling almost 7 percent against the dollar this year and dropping below its key support level of 1.50 against the dollar last Friday on worse-than-expected manufacturing data from the U.K.
(Read More: Pound Tumbles as UK Heads for Further QE)
Nenner told CNBC the pound's decline would continue into the summer, according to his analysis of the pound/dollar cycle.
"We've hit 1.50 and if we get close to 1.49 then we'll go to 1.44 and if we get to that point before July, it could go even lower," he told CNBC's "European Closing Bell."
"Austerity is not going to work in Britain and knowledgeable people know when something fishy is going on. I do my research and when the cycle is going down, so does the cable (the GBP/USD pairing) and you have to wait for the cycle to bottom - there's nothing else you can do," he said.
Even if the Bank of England introduces further quantitative easing (QE) when it meets to decide on monetary policy on Thursday, it would not support the currency, he remarked.