British Prime Minister's Trade Envoy David Puttnam said Thursday that the country looked to boost bilateral trade volume with Cambodia to $5 billion by 2020.

"The bilateral trade between the UK and Cambodia reached $1 billion last year and we expect the trade volume will hit $5 billion by 2020," he told reporters after a luncheon meeting with British businesspeople in Cambodia.

Puttnam said his visit to Cambodia aimed to further promote trade and investment relations between the two countries and he encouraged British investors to increase investment in Cambodia so as to contribute to further enhancing bilateral relations.

Britain is the fourth largest investor in Cambodia. According to the report of the Council for the Development of Cambodia, Cambodia had received Britain's promised investment of $2.4 billion in the last two decades.

British investors are operating businesses here in garment and footwear industries, banking and finance, engineering and architecture, education, hospitality and property services.

British Prime Minister David Cameron appointed Puttnam as trade envoy to Cambodia, Vietnam, Laos and Myanmar in November 2012.

Puttnam arrived in Cambodia on Tuesday for a four-day visit to strengthen trade and investment relations between the two countries. During his stay, he had met with Education Minister Hang Choun Naron, and Commerce Minister Sun Chanthol, to discuss business and education opportunities and challenges.