THE Government came under fire from legislators yesterday for delays in land supply which will lead to hold ups in the completion of more than 31,000 public housing flats. Under the Government's Long Term Housing Strategy, of the 63,000 public housing flats planned to be completed by 2001, 31,400 will have to be finished two years later than scheduled. A mid-term review shows trivial pre-contract procedures between departments delayed site availability. In yesterday's meeting of the Housing Panel, Deputy Secretary for Planning, Environment and Lands Leo Kwan Wing-wah said the Government could still achieve targets set in the strategy. United Democrat legislator Lee Wing-tat said: ''If you cannot achieve your target according to the schedule set in the report, then you have failed''.