Ok, this is an easy setup. Now why am i shorting right now right here. Because i am also looking at other GBP pairs, and they are all looking very heavy.
Especially GbpChf also made a nice SHS pattern and broke lower. I'm looking there for a small bounce to short it too.
Blessings to you.
Edit: I'm sorry while typing it fell almost 30 pips, i could not post it earlier, but there is still a good chance for a move above 150 before falling.