I don't advise you trade any GBP pairs for the next week on the basis of article 50 being triggered and the consequences arising from it in terms of volatility.
However, what I would like to highlight is looking at price action in the red circle. A set of bearish candles had formed followed by a doji and then what a call a pin type par. Also notice the 50% fib acting as n area of support.
No trades on this but worth observing and learning about price action and S/R areas for new traders!