What is a major flaw in its construction? (Hint: Is the Second Estimate of the GDP growth three times bigger than the First Estimate?)

UK 2016 Q4 GDP GROWTH ESTIMATES 2016 Q4 GROWTH UPGRADED Second estimate 0.70% First estimate 0.60% 0.55% 0.55% 0.60% 0.60% 0.65% 0.65% 0.70% 0.70% 0.75% 0.75% Source: ONS