EURGBP intense movement ahead

Last few 4h candles are in a very narrow price range, thus I am expecting intense price movement (maybe on London opening). As we are in the down trend I would go short from the current level with short 30 pips SL near the border of ichimooku cloud and above the last top fractal. My idea:

sell @ 0.84715
SL @ 0.85030
no TP -> trailing SL through the next top fractals