Pound hit 34 year low on 11th August - about US$1.2080 / HK$9.42 as hard Brexit seemed increasing reality. Forecasters said if it occurs expect £ to hit US$1.10. UK will leave EU on 31/1/2020 as stated above but terms to be finalised by 31/12/2020 - BoJo says will bar any negotiation beyond that date by law to be introduced (listen to Queen’s speech, possibly tomorrow??) So hard Brexit still a possibility. Projection? Volatility - others may comment on how you trade that.
Dead in a ditch???
Unless there is a hard deadline these things drag on. I suspect 18 months to get the deal done with 2 extension of the hard end date.