GBP/USD starts week on cautious note after 0.9% fall Fri on global bond rout

Traders wary, rapid 2.2% fall from Wednesday 1.4240 high unnerves bulls

Risk shakeout triggers sharp correction after 5% rise from 1.3566 Feb 4 low

U.K. budget Wed; Finance Minister Sunak to borrow heavily again nL8N2KV6AE

Will set out plans to raise income tax by 6 bln pounds-The TimesnL2N2KY00V

Support 1.3870-1.3900, 1.3820-30; resistance 1.3990-1.4000, 1.4025-30

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