Mr Harris is described as an experienced walker
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Fears are growing for the welfare of a senior manager with the Parole Board who has been missing for a week on the Canary Islands.
Mark Harris, 57, the organisation's new director of quality and standards, was reported missing after going on a solo mountain walk on La Palma.
A search involving helicopters and dogs failed to find any trace of Mr Harris, who is from north London.
His family say he is an experienced walker and fear he may have fallen.
'Very resourceful'
Mr Harris disappeared on Friday 3 August after failing to meet his wife and teenage daughter after setting off on a 13km hike from Los Brecitos to the Playa de Taburiente campsite.
Family members and fellow tourists have also been searching for him.
Daughter-in-law Renee Harris, on behalf of the family, said: "We are trying to stay as positive as we can.
"Mark is a very resourceful and strong man and so loved by everyone - his family, his friends and his colleagues. We are trying to stay positive but it is difficult as the days go on."
His family are urging anyone with information on Mr Harris to call authorities in La Palma.
The head of the Parole Board, Christine Glenn, said: "I have been in contact with Mark's family throughout this incident and have sent them the thoughts and prayers of everyone at the Parole Board at this very difficult time together with our best hopes for his safe return."