The company, which recently welcomed a visit from Princess Anne to celebrate its move out of the Olympic zone, said that after winning in 2007 and 2008 it did not expect to be recognised again this year.

Jenny Reed, marketing manager at Park, said: "When we put the award entry in, we even said to them, 'look I know we have won it the last two years but so much has changed'.

"We didn't expect to be recognised again, but it shows there is a continuation of green activities here – there is so much more this year."

Park's victories have been helped in part by the new Beckton site, which was built when it was moved out of the Olympic zone, however its credentials were already in place as the first award was won while at its old Hackney facility.

The company has taken on board several measures that contributed to the award, including the use of hot-melt PUR glue, which the company believes gives off 50 times less emissions. In addition, it strengthened its environmental committee and improved its waste segregation.

The team also improved its transportation network, consolidating runs to reduce emissions and energy use, and updated its internal measuring system, so that year-on-year improvements could be measured.

Managing director Alison Branch said: "We are delighted that our dedication has been recognised by these awards. At Park we are committed to making a positive contribution towards environmental protection

"We continually strive to achieve this through minimising the impact our business has on the environment and raising awareness of environmental concerns among our stakeholders: in doing so, we not only protect the environment, but also improve business processes and reduce costs."