S. 151 : Reassessment-Sanction for issue of notice-Writ petition-Alternative remedy-Where appeal and revision proceedings were already pending against a reassessment order, writ petition challenging the said order on the ground of invalid sanction under section 151 was not to be entertained as the assessee had already availed of statutory remedies. [S 144, 144B, 147, 264, Art. 226]