S. 197: Deduction at source-Certificate for lower rate-Payment to Non-resident-Withholding Certificate-Rejection of a Nil Withholding Certificate is unsustainable where the AO fails to consider the statutory factors under section 197 before determining the withholding tax liability-Matter remanded-DTAA-India-UK.[S. 195, Rule 28AA, Art. 13, Art. 226]