Entering short is possible from 6850 resistance area or after hourly close below red trendline at S2 level 6800. The following support zones for the index are 6770 and 6740 (as described in 4H chart).
Once FTSE 100 falls below 6740, we'll have extra short potential down to 6660.
FTSE 100 has tested 6740 area and trades below yesterday immediate support and current signal line (red) at 6770. Below 6780 there's a possibility of the index extending its fall down to 6660.