Prince Charles is boosting his green credentials by flying on a regular passenger plane for his trip to the Caribbean next month.

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The prince – who has publicly announced his commitment to cutting his personal output of carbon dioxide – and his wife Camilla, the Duchess of Cornwall, will fly in business class on the British Airways flight in a bid to cut their ‘carbon footprint’.

The couple will also use a boat to sail between engagements on the various islands during the trip. Senior royal sources admit Charles has little choice over his travel arrangements, as next week he is due to give a speech on environmental issues to European Union leaders in Belgium, Brussels.

An insider told The Sun: “There was no way he could justify chartering his own flight.”

Last year, it was announced the royal family would endeavour to reduce their use of private helicopters and chartered planes in order to cut their personal carbon dioxide output.

However, Prince Andrew is yet to follow Charles’ example, and he recently attracted criticism for spending UKP100,000 of taxpayers’ money to hire a private jet for his 11-day US tour this month.