When is UK GDP and how could affect GBP/USD?
UK final Q4 GDP Overview
The UK docket has the final GDP report alongside current account data, which will be published later this session at 9.30GMT. The third and final estimate of the United Kingdom GDP is expected to remain steady in the fourth quarter, from the third, when it rose 0.7%. The annualized reading is also expected to show no change in the last quarter of 2016, staying flat at 2%.
Deviation impact on GBP/USD
Readers can find FX Street's proprietary deviation impact map of the event below. As observed the reaction is likely to remain confined between 10 and 40 pips in deviations up to 2.5 to -2.5, although in some cases, if notable enough, a deviation can fuel movements of up to 70 pips.

How could affect GBP/USD?
Should the data come in line or better-than with expectations, the bulls would regain control, sending cable back towards 1.25 handle. While a weaker GDP report could aggravate the selling pressure, knocking-off the GBP/USD pair further towards 1.2380 levels.
Key notes
UK GDP in focus today – TDS
“UK: For the third and final reading for 2016Q4 GDP markets don’t expect a revision to the previous 0.7% q/q, although we see scope for an upside surprise should the positive revisions to industrial production and construction not be offset by downward revisions elsewhere.”
About UK final GDP
The Gross Domestic Product released by the National Statistics is a measure of the total value of all goods and services produced by the UK. The GDP is considered as a broad measure of the UK economic activity. Generally speaking, a rising trend has a positive effect on the GBP, while a falling trend is seen as negative (or bearish).