More than 70 areas of Britain have seen the biggest surge in the non-UK born population, new data revealing the changing face of Britain shows today.

In some parts of the country the number of people born abroad has soared by as much as 10-fold. There are 77 places where the number has increased at least 6 per cent.

Boston in Lincolnshire is the most changed place in Britain between 2007 and 2017.  The town’s population of people born overseas has soared from 3 per cent to 29 per cent.

Many of the places with the biggest change were also the most strongly supportive of Brexit.

Today’s data from the Office for National Statistics also reveals there are more Romanians living in Britain than Irish for the first time.

And the population in parts of London is due to expand by nearly a fifth over a decade as immigration helps push England’s population to 58.5million.

The swelling capital is expected to be the biggest contributor to growth in numbers over the coming years, according to official estimates released today.

London is set to have 9.54million residents – just short of Megacity status – by 2026,  up 774,000 from the middle of 2016. The 8.8 per cent net increase drives an England-wide growth of 5.9 per cent.

The ONS’s latest mid-term population forecasts show that migration from abroad will add 754,000 to the size of London by 2026.

Another 771,000 is as a result of the birth rate being higher than the death rate.

However, the rise in numbers will be offset by 757,000 Londoners moving to other parts of the UK.

Five of the 10 authorities where growth is expected to be highest are in London.

Barrow in Furness is predicted to be down 4.6 per cent to 64,400, and Copeland 4.2 per cent 66,400.

Of the 3.23million increase forecast in the population of England, nearly half – 1.72million – is accounted for by immigration.

The rest is almost all down to the gap between birth rate being higher than the death rate.

The proportion of local authorities where more than a quarter of people are aged 65 or over is expected to treble, from a ninth to a third.

ONS population expert Andrew Nash said: ‘While the overall populations of all regions in England are projected to increase over the next decade, reasons for these increases vary greatly depending on where you live.

‘For instance, projected population change in London is mainly caused by natural change – the difference between the number of births and deaths – and not migration.

‘This is because London’s net inflow of international migrants is offset by a similar number of people moving to other parts of the UK.

‘That contrasts with the North East, where growth is mostly down to migration.

‘What’s also clear is that the population is ageing in all regions, with the number of people aged 65 and over growing considerably faster than younger age groups.’

Meanwhile, the ONS has released separate figures on the breakdown of the UK population by country of birth and nationality.

The non-UK born population rose from 9.2million in 2016 to 9.4million last year and the non-British population went up from 6million to 6.2million.

Romanian has become the second most common non-British nationality in the UK, figures show.

The number of Romanian nationals living in the UK in 2017 was estimated to be 411,000 – a jump of 25 per cent on the previous year, and the largest increase for any country.

Polish remains the most common non-British nationality, with an estimated one million in the UK. Romania has overtaken the Republic of Ireland and India to move from fourth to second place in the list.

Some 350,000 Irish nationals lived in the UK in 2017, while there were 346,000 Indians.

Nicola White of the ONS migration statistics division said: ‘Non-UK born and non-British populations continued to increase in 2017, as more people continued to come to the UK to live than move to live abroad for a year or more.

‘Poland-born residents and Polish nationals were the most common populations from outside the UK. However, the largest increases in population were seen from those born in Romania and those with Romanian nationality.’

Alp Mehmet, Vice Chairman of Migration Watch UK, said: ‘There is still no sign of a net outflow of EU-born people as a result of Brexit.

‘Indeed, they are still coming in significant numbers and contributing to a population increase which is simply unsustainable.’