The rally from 1.6775 is an impulse (5 waves) and a corrective decline from 1.7635 may be complete at 1.7375. The position of the EURUSD suggests that a corrective decline in the GBPUSD is complete at that level, so a bullish bias is warranted.
1.8266 would be where waves C and A would be equal assuming that the rally from 1.6775 ends up as an A-B-C advance.