P122 CEEFAX 122 Sat 16 Apr 17:23/24       BNOC SEEKS PRICE COMMITMENT  The British National Oil Corporation is reported to have asked its customers to extend their acceptance of its new North Sea prices until the end of June. Industry sources were quoted as saying that BNOC was trying to dispel market uncertainty over second-quartet price levels by seeking furthjt confirmation of its new package, based on a $30-per- barrel price for Brent field crude. * Many of BNOC's biggest customers, BP and Exxon included, have refused to confirm the new pricing structure beyond the end of March  CITZNEWS INDEX 120 