Printer Amash Shah Syed, 50, told the court that Ms Spence, who was very friendly with his wife, came to his home in late summer or autumn 2010 and asked him to make the bonds as a prank.

BBC: Lynda Spence trial: Missing woman was 'sent text threat'

They follow a seasonal pattern reflecting the academic year, with lower rates in the autumn followed by a gradual rise in spring and early summer to a peak in late summer.

BBC: One in six young people not in education