Being contained by the support of the price channel on 4-hour chart, GBPUSD rebounded from 1.3235, indicating that the pair remains in uptrend from 1.2865. Another rise to test 1.3480 (Jul 15 high) resistance is possible in a couple of days. On the downside, a clear break below the channel support will signal completion of the uptrend, and the following downward movement could bring price to 1.2900 zone.