GBP/USD rose 0.3% to 1.3535 at 04:30 ET (08:30 GMT) amid a weaker dollar.
Dollar pressure stemmed from easing Middle East tensions and declining oil prices that removed support for the greenback.
ING analysts say markets are heavily tilted toward a benign geopolitical outcome, limiting further upside for the pound.
Euro held near recent highs ahead of Christine Lagarde comments; BoE officials' remarks expected but rate‑hike expectations may be overstated.