It might be a good day to change your chips into Sterlings. What remains to be seen is the long term trend. It will make up some of its losses past the initial shock, but I wouldn't be too rosy about the currency's future.
It's suddenly a lot more cash now, but the question is, how far will that cash get you in the UK 10 years down the line?
I suspect inflation is not going to be kind on the ex-EU Kingdom.