• Cable holds below 1.36 before potentially crucial speech from UK PM Starmer

• Former UK minister Catherine West threatens leadership challenge

• 1.3548 was early Asia low (fraction shy of Friday low). 1.36379 was pre-weekend high

• Safe-haven dollar gains after Trump says Iran peace offer "unacceptable"

• CFTC data: net GBP short rose 5% to 7-week high of 63,908 contracts in week to May 5

• Reuters Breakingviews-How the United Kingdom could rejoin the EU

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(Robert Howard is a Reuters market analyst. The views expressed are his own)