Weekly: Last month, the pair created a higher high at 1.8000, formation then formed as a sign of retracement. With weekly time frame, especially on GBP pair, I would expect something like 0.786 Fibonacci to be met. 1.7000 would be my main target for GBPAUD until the end of the month.
Daily: On daily time frame, after 4 weeks of consistently , price found a support at 1.7100 and was pushed up slightly. This is just a retracement for a long-term . I believe that price could retest the 1.7500 key level and then fall to 1.7000 by the end of January