Approaches swing lows pre-Brexit
The GBPUSD on January 24 broke above swing lows from pre-Brexit at 1.4004-11 area. Thosw lows were reached in April and June of 2016.
On January 30, the price moved below that swing area, but rebounded back higher. Today, the price moved back down toward that old swing level reaching a low of 1.40248. I would not call it a strong test of the support - you like to get closer - but it "approached" the level. The current price is trading at 1.4045 currently.
Drilling to the hourly chart, the price today fell a bullish above/bearish below swing level at 1.40814 area (see red circles) and also a lower trend line at 1.4062. Those level are now risk levels for shorts. Look for sellers to lean against the 1.4062 level now. Traders who want to risk more (or be a more patient seller), would look toward the 1.4081 level as a risk defining level now.
The 1.4004-11 will be a touch nut to crack (if the price rotates toward the level be prepared to see buyer on the test). However a break below would see the next target toward the Jan 30 low at 1.39789 level.