The crux is the meaning of trend, or more specifically the trend timeframe.
Let’s say right now, and the tf is intraday, say hr1.
On GBP/USD price was down Asian and then headed up against the recent USD trend.
Aha! a trend reversal - there’s an indecision candle right at 9.00am GMT and Uk is now on GMT and traders are at their desks.
So why the intraday reversal at 15.00 gmt (arrowed)?
Trend reversals are driven by reversals in the market - check Eur/Gbp h1 and it’s possible to witness the optimism in the market of a Brexit deal.
At 15.50 the news of a Uk cabinet resignation on Brexit hit the market and the reversal candle after the arrow was complete.
Btw - the spike up candle likely has a TA name, note that it reached up to the Asian session mid level.