Richard Mylchreest asked his girlfriend Sam Lindsey-Birchall to marry him during a visit to the Tower of Refuge in the Isle of Man which is usually cut off by the sea.
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Michael Dunn started abusing the victim when she was 14 and concealed her in a hidey-hole out of the view of police.
Robert Dunn said the 27-year sentence given to his brother was too lenient and said he would build the gallows himself to hang him
The victim of a paedophile who was kept prisoner from the age of 14 has spoken exclusively to Granada Reports.