From Goldman:
1. With the prospect of a ‘hard Brexit’ becoming a reality, investors who were previously expecting a ‘soft’ Brexit, or no Brexit at all, have updated their priors, and Sterling has depreciated about 5 percent over the space of a week against G10 currencies. GBP/$ is about 1.5 percent above 1.20, which is our 3-months forecast published on 5 July 2016. In a recent Global Markets Daily (“How Much Sterling Downside?, 6 Oct 2016), we highlighted that risks to our Sterling forecast were to the downside. In this FX Views, we quantify the magnitude of a potential further fall in the Pound. Based on our benchmark model that assesses the impact of political uncertainty on currencies, the cumulative depreciation of Cable could be as large as 25 percent by year-end, an additional 7 percent decline from its current value.
2. While this estimate is subject to the usual degree of model uncertainty (see below) and should be viewed with a degree of caution,the following additional considerations lead us to think that such a downside move in Sterling is quite likely to materialize over the next couple of months.
