Along with the flash crash in the pound towards the end of last week the UK 10-year yield on government debt briefly spiked over 1% showing signs of market stress towards the UK economy and its ability to negotiate its exit from the Eurozone. Short term investor sentiment seems to be closely linked to economic data and rhetoric from the UK and European governments surrounding Brexit negotiations. The outcome of these negotiations appears set to be the driver of investment sentiment towards UK indexes over the short to medium term.