CORRECTED-North Sea Crude- WTI, Forties and Ekofisk firm

(Corrects to make clear Gunvor bought Forties and WTI cargoes on Monday, not two WTI cargoes) LONDON, June 25 (Reuters) - U.S. WTI Midland and North Sea Forties and Ekofisk crude differentials rose on Tuesday as keen buying interest in the Platts window persisted. * Oil platform workers at CNOOC represented by the Unite union voted to accept a pay deal on Tuesday. * The staff concerned work on the Scott, Buzzard and Golden Eagle platforms. PLATTS WINDOW * Indications are on a free-on-board (FOB) basis unless marked as cost, insurance and freight (CIF) or delivered at place (DAP). * WTI Midland: Trafigura bought a July 18-22 cargo from Glencore at dated Brent plus $2.55 CIF Rotterdam. * WTI Midland: Trafigura also bid for July 8-13 dates at dated plus $2.85 CIF Rotterdam. * WTI Midland: Aramco offered July 25-29 at dated plus $2.70 CIF Rotterdam. * The midpoint of the deal and the value implied from the higher bid, equated to around dated plus $1.55 on a FOB basis, according to Reuters calculations. * On Monday, Gunvor bought WTI Midland July 15-19 from Glencore CIF Rotterdam at dated Brent plus $2.50. * Forties: Trafigura bid for a July 5-22 cargo at dated plus $1.60 FOB. * On Monday, Gunvor bought CIF Rotterdam July 6-10 from Total at dated plus $2.85, or about dated plus $1.47 on an FOB basis according to Reuters calculations. * Ekofisk: Trafigura bids July 5-23 at dated plus $2.75 FOB. * Trafigura had bid for July 8-25 on Monday at dated Brent plus $2.70. (Reporting by Robert Harvey; Editing by Krishna Chandra Eluri)