Scots oil workers have ballooned in weight by nearly 20 per cent since 1985, according to a new report.

In its latest health and safety report, industry body Oil and Gas UK (OGUK) said the average weight of men working in the offshore oil and gas industry rose by 19 per cent between 1985 and 2009.

A typical man working on the North Sea rigs now weighs more than 14 stone compared to under 12 stone in 1985.

The increase will fuel growing concern over the health and shape of the thousands of offshore workers, as well as the safety implications of transporting bigger employees by helicopter.

Earlier this year regulators said that from April 1, 2015, oil workers unable to get through aircraft emergency windows while wearing their survival suits would not be allowed to board helicopters.

But the Civil Aviation Authority later insisted nobody would lose their job for being overweight.

The OGUK report said: "The last survey of offshore workers' body sizes was completed almost 30 years ago and since then the ­average weight of the workforce has increased by around 19 per cent.

"The heaviest individuals are proportionally even heavier."

Overall, the report offers a mixed picture of offshore health and safety performance during the past year.

The period covers the ditching of a North Sea ­helicopter, with the loss of four lives, on its way to Sumburgh Airport.

An Air Accident ­Investigation Branch inquiry into the disaster is currently continuing.