EDUCATIONISTS are angry Governor Chris Patten's promise to upgrade salaries for 180 primary school teachers this school year has been delayed without any promise of back pay. The chairman of the Subsidised Primary Schools Council, Lee Siu-tin, warned the move could damage teacher morale. Mr Patten pledged in his 1993 policy address to upgrade 860 primary school teaching posts to graduate level in order to attract and keep better qualified staff. About 180 teachers stand to benefit from the scheme this school year. The president of the Hong Kong Teachers' Association, Terence Teng Chong-tai, said: 'It is a matter of principle that the teachers are fighting for.' But Director of Education Lam Woon-kwong insisted yesterday that there would be no back pay when he officiated at the start of the Respect Our Teachers Campaign. The campaign is aimed at improving the image and morale of teachers.