GDP in the UK is hugelly manipulated anyways.
I remember back in 2012 when in the aftermath of the 2008 there was a "double dip recession" (a bit of GDP fall, twice) according to Official figures. Well, a few years later a group of Economists calculated GDP from the very same source figures and the result was very different from the Official GDP, with Britain having actually had a Depression (a GDP fall of over 4%).
And don't get me started at the whole scam of using the CPI measure of inflation that excludes housing rather than the CPI-H that includes it in the calculation of the Real GDP (which is the official one) even though house prices go into calculating the Nominal GDP via a mechanism called "inputted rent". Housing inflation goes into the nominal GDP and then the Inflation figures which are used to strip out the inflation from it to make the Official GDP (using something called the GDP Deflator, were the higher the Inflation the lower the resulting GDP) don't include house price inflation.
Thanks to this scam, because housing inflation does go into the raw GDP and the inflation from housing which is never stripped out when making the official GDP figures from it, Britain's realestate bubble ends up at the other end of this process with politicians harping about how great they are at managing the country because GDP went up, the worse the realestate bubble the more they have made Britain "grow".
I suspect that most people in Britain (especially the younger generations) don't at all feel all that "growth", quite the contrary.