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Raymond and Constance Heath, 82 and 79 respectively, were on a £3,650 holiday to Sal on the island of Cape Verde when the accident occurred in December 2009, the Daily Mail reports.
They had asked for help disembarking in Sal, but no staff came to assist them.
The pensioners attempted to make their own way down the steps, but were distracted after cabin crew told them to "hurry up" and both fell from top to bottom.
Although Mr Heath escaped with only a few cuts, Mrs Heath was almost "scalped" and had to spend several weeks in hospital. She is still so frail she may never recover.
The Heaths have now launched a compensation claim against Thomson for "substantial" damages.
"To put it bluntly, our lives have been ruined," Mr Heath said.
Thomson, which employs almost 18,000 people worldwide, denied liability and declined to comment.
Posted by Patrick White
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