Insurers may be left to pick up the bill for deep vein thrombosis (DVT) claims, warns a leading lawyer.

The threat comes in light of government guidelines into “economy-class syndrome”. Airlines will now have to publish health warnings with tickets on long-haul journeys to prevent deaths and injuries from blood clots.

Nicholas Hughes, head of aerospace at Barlow Lyde and Gilbert, which provides advice to the London Market, said flight operators with fully comprehensive insurance may turn to insurers in the event of a claim.

He added: “A measured approach needs to be taken by airlines and underwriters.”