T-shirts are among the fastest-growing categories exported through Londons Heathrow airport

T-shirts are among the fastest-growing categories exported through London's Heathrow airport

Around 3,640 tonnes of T-shirts and similar knitted garments are shipped through London's Heathrow airport, making this one of the top exports by weight and one of the fastest-growing categories.

New UK Customs data also reveals that women's and girls' overcoats and raincoats are another of the biggest growth exports by weight via Heathrow, with a 60% growth year-on-year.

The numbers, for the 12 months between August 2014 and July 2015, show T-shirts and similar knitted garments as the sixth largest category by weight to be exported through Heathrow. This is also one of the fastest-growing categories, surging by a massive 62.0% between 2014 and 2015, according to figures shared with just-style, from 2,247 tonnes to 3,640 tonnes.

Women's and girls' overcoats, raincoats, anoraks, ski-jackets and windbreakers also make it into the top-10 growth exports by weight, jumping 59.8% from 1,576 tonnes in 2014 to 2,518 tonnes in the year to July 2015.

The data also shows that 345,575 tonnes of British goods worth more than GBP48bn took off from Heathrow last year – of which more than GBP7bn travelled to China. The US, however, is the top export destination by value, with Hong Kong in third place.

Topping the list of exports by weight is fresh salmon, followed by books and brochures, medicines, hatching eggs for poultry, and vehicle parts. By value, the leading exports are precious metals, jewellery, aircraft turbojets, medicines, paintings and drawings.

Heathrow is the biggest port in the UK by goods value and has just announced that it will invest GBP180m into its cargo operations.