GBPUSD may be forming a cycle top at 1.5895 level on 4-hour chart. Another fall to re-test 1.5649 key support is expected later today, a break below this level will confirm the cycle top, then deeper decline could be seen to 1.5500-1.5550 area. Only break above 1.5649 level could suggest that lengthier correction of downtrend from 1.6105 is underway.