Household spending slowed to its lowest annual growth for six years in 2017 amid Brexit-fuelled inflation, with borrowing surging and family savings slumping to a record low.

Figures from the Office for National Statistics (ONS) confirmed economic growth slowed to 0.4% in the final three months of last year, down from 0.5% in the third quarter as weaker household spending took its toll.

The ONS revised upgrowth for the year as a whole to 1.8% from the previous estimate of 1.7%, but this was still the lowest since 2012.

It leaves the UK with the lowest growth among the G7 economies at the end of 2017 as it enters the final year of its membership of the European Union.

The quarterly national accounts data showed Britons turned to debt to support spending in the face of last year’s surging inflation, which outstripped paltry wage growth.

The proportion of total income saved by households dropped to 4.9% in 2017, its lowest level since records began in 1963, the ONS said.

Overall household spending fell last year to 1.7%, which was the lowest annual growth since 2011, according to the ONS.

But there was some cheer in Thursday’s latest official data dump as figures revealed the UK’s current account deficit with the rest of the world narrowed to £82.9bn or 4.1% of gross domestic product (GDP) in 2017 – the smallest gap since 2011.

This came as a growing world economy boosted the earnings on foreign investments.

In the fourth quarter, the current account deficit shrank by more than expected to £18.4bn, or 3.6% of GDP, down from £19.2bn in the previous three months.

Net trade – exports less imports – made its largest contribution to full-year growth since 2011, the ONS reported.

Economists said there would be some relief on the way this year for households as wages are expected to start rising faster than inflation, which should help maintain growth in 2018.

But the Bank of England has already warned of a “beast from the east” hit to the first quarter of 2018, which could see growth slow to 0.3%.

Howard Archer, the chief economic adviser at the EY Item Club, said this would only be temporary, with a bounce back to 0.5% in the second quarter likely.

He added: “Growth in 2018 should be helped by the squeeze on consumers easing as the year progresses with earnings growth firming and inflation easing back.

“Agreement on a Brexit transition arrangement should also be supportive to business investment. However, ongoing uncertainties over the future trade relationship between the UK and EU will likely still limit the upside for investment.”

John Hawksworth, the chief economist at PwC, said the 2017 data showed the UK “remaining in the slow lane of global growth”.

He said: “Among the G7, the UK was the only economy to see a deceleration in growth between 2016 and 2017, which does point to the dampening impact of Brexit-related uncertainty on UK business investment and the squeeze on consumers.”

A breakdown of the ONS figures showed growth in the dominant services industry was revised down to 0.4% in the fourth quarter from the 0.6% previous estimate, a move that was partly offset by an upward revision to construction.