British Preliminary Gross Domestic Product (GDP) is a key release and is published each quarter. GDP measures production and growth of the economy, and is considered by analysts as one the most important indicators of economic activity. Preliminary GDP is the first version of the indicator and tends to have the most impact. A reading which is higher than the market forecast is bullish for the pound. Here are all the details, and 5 possible outcomes for GBP/USD. Published on Tuesday at 9:30 GMT. Indicator Background British Preliminary GDP is a key economic indicator, and provides an excellent indication of the health ... (full story)