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A "dramatic" fall in car production and an easing of stockpiling by manufacturers meant the economy shrank in April, official figures show.
The economy contracted 0.4% from the month before, according to the Office for National Statistics (ONS).
The contraction meant growth for the three months to April slowed to 0.3%.
Factory shutdowns designed to cope with disruption from a March Brexit slashed UK car production in April by nearly half, the industry said last month.
BMW's Mini factory in Oxford brought forward its summer maintenance shutdown to April to minimise any disruption surrounding Brexit. Other manufacturers' annual stoppages were also brought forward.
The economy had seen a spurt of growth in the run-up to the proposed March date for the UK leaving the European Union, as manufacturers stockpiled parts, raw materials and goods in the anticipation of holdups at the border.
After the Brexit deadline was extended to October, it suffered the reverse effects as these supply reserves were used up and fewer purchases were made.
"The hangover that's followed the UK's original exit date is proving stronger than anticipated, said Yael Selfin, chief economist at accountants KPMG UK.
"Today's figures signal the UK economy is likely to experience more subdued growth for the rest of the year, marred by Brexit uncertainty."
ONS statistician Rob Kent-Smith said: "Growth showed some weakening across the latest three months, with the economy shrinking in the month of April mainly due to a dramatic fall in car production, with uncertainty ahead of the UK's original EU departure date leading to planned shutdowns.
"There was also widespread weakness across manufacturing in April, as the boost from the early completion of orders ahead of the UK's original EU departure date has faded."
The economy had seen a spurt of growth in the run-up to the proposed March date for the UK leaving the European Union, as manufacturers stockpiled parts, raw materials and goods in the anticipation of holdups at the border.
After the Brexit deadline was extended to October, it suffered the reverse effects as these supply reserves were used up and fewer purchases were made.
"The hangover that's followed the UK's original exit date is proving stronger than anticipated, said Yael Selfin, chief economist at accountants KPMG UK.
"Today's figures signal the UK economy is likely to experience more subdued growth for the rest of the year, marred by Brexit uncertainty."
ONS statistician Rob Kent-Smith said: "Growth showed some weakening across the latest three months, with the economy shrinking in the month of April mainly due to a dramatic fall in car production, with uncertainty ahead of the UK's original EU departure date leading to planned shutdowns.
"There was also widespread weakness across manufacturing in April, as the boost from the early completion of orders ahead of the UK's original EU departure date has faded."
source: BBC News