• Cable holds above 1.3600 after positive start to May

• 1.3600 is a former resistance level turned support point

• Offers pre-1.36 capped GBP/USD gains in mid-April

• 1.3642 was 10-week peak as dollar softened on news from Iran

• Iran sends proposal for negotiations with U.S. to mediator Pakistan

• Next week's key UK event risk is local elections on May 7

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