Landing distance requirements, JAR-OPS 1.515
The landing distance required on a dry runway for destination and alternate aerodromes from 50ft to a full stop must not exceed:
a) 60% of the LDA for turbo-jet aeroplanes
b) 70% of the LDA for turboprop aeroplanes
Now, considering that the LDA is a runway available after threshold or displaced threshold the runway length in your case is inadequate.
I'm surprised that the local ATC has not filed the report of those pilots who land before the displaced threshold, because at least where I'm located that would be the case. It is definitely PROHIBITED.
Best Regards,
-AM-