In the previous three months, we saw lower rebounds for GBPUSD: 1.3300, 1.3250, 1.3170.
By now, it has returned to major support line at 1.27, from where the pair rebounded in August and November. Also, this level was an important watershed in 2017, which increases its importance. THis line
Falling under this support can start the movement down to 1.20, to lows after Brexit.
If the pair can keep above 1.27, we can be seen this as a signal that investors believe in smoothly Brexit that may follows another one rebound above 1.3000. But even in this case we should pay attention, that GBPUSD becomes lower overtime.