So would you be happy if the £ went up and was trading at $5........
The currency markets are pencilling in $1.10 to the pound in 2017. Currency speculators have smelt blood as they did during the ERM debacle that resulted in Black Wednesday. The pound is now under the scrutiny of these speculators. They will be watching to see what the government/Bank of England will do to 'protect' sterling. There is money to be made for those speculators and they will be rubbing their hands and smiling that they will make a bundle.
There is jitters and any wrong word will be ceased on to send the pound down. They would expect the government/Bank of England to step in and buy pounds, off those speculators who pushed the price of sterling down incidently, that will push it back up. If there is inaction on the part of the government/Bank of England and they let the pound drift, or a rift between the two - as is evident of May's QE statement, also a cause of sending sterling down - currency speculators will seize on it. May's QE statement was an announcement that the Bank of England will not be buying government bonds, didn't go down well with those in the Far East, which borrows huge amounts of money off UK banks and other financial institutes to buy London property.
In Europe, they know they can send a shot across the bows of the UK and it will have an affect - as the Financial Times Hollande article shows, which was a contributing factor to the speculation. The French used to devalue the Franc against the German Mark in particular, to make their goods cheaper compared to Germany's. Affecting currency fluctuations as a means of economic policy was the main driving force behind the German's push for a single currency.
A falling pound should open opportunities for UK manufacturers, but because the UK financial sector is very reluctant to lend long term to manufacturing industry, they will find it difficult to take advantage of a falling pound.