Today’s GBPUSD play would highly depend on the preliminary quarterly GDP reports today. If this news come in trumps we might see a market reaction pushing for yesterday’s high and possibly 1.6600 mark. But any negative report should set the tone for a possible 1.6330 again.
Forex is a short form of Foreign Exchange and it is a speculative market where each currency pair are traded on the spot. Mildly put it is an auction where sellers are asking for certain prices against a buyer’s bid price. The high liquidity of the market means that you will always have buyers/sellers 24/6 of the week.