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Concerns have been raised about the participation of a UK science vessel in an Arctic tourist voyage.

Funded by the UK government, the RRS Ernest Shackleton normally carries out support work for the British Antarctic Survey (BAS).

But this summer the ice breaker has been chartered to accompany a luxury liners voyage in the Arctic.

Critics say its inappropriate for a vessel dedicated to science to support tourism in such a fragile area.

Global warming has seen a rapid rise in the number of ships travelling through Arctic waters in recent years.

The Northwest Passage - a short cut from Asia to Europe through the Canadian Arctic - first became fully clear of ice in the summer in 2007.

Since then only a handful of ships have travelled the route - 17 in 2015, according to the US Coast Guard.

This summer the Crystal Serenity aims to become the biggest passenger ship yet to attempt to sail through the famous route.

Starting in Alaska, the 32-day voyage will see the 1,700 passengers and crew travel 1,500km across the top of Canada, ultimately ending in New York.

Berths on the 14-deck luxury liner are not cheap, starting at around $20,000 per person and running up to $120,000 for a deluxe stateroom.

While the route is accessible to ships, it is not ice-free and the company behind the voyage has chartered the ice breaker, RRS Ernest Shackleton, from the British Antarctic Survey.

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