GBPUSD moves in a bullish price channel on 4-hour, indicating that the pair remains in uptrend from 1.2365. As long as the pair is in the channel, the uptrend could be expected to continue, and further rise to 1.3100 area is still possible. Near term support is at the bottom of the channel and the key support is at 1.2844, only a breakdown below this level could signal completion of the uptrend.
