Paedophile Geoffrey Portway will be deported from the US to Britain at the end of his jail sentence, which will be between 18 and 27 years.
Portway, who was born in Spain, possessed more than 20,000 images and videos of children being abused.
In recovered online discussions, he described his home-made dungeon as a place he intended to keep kidnapped children, sexually abuse them, murder them and then eat them.
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Some 13% of the average UK adult's salary is spent paying basic domestic bills, which is an average total of £524,464 over a lifetime.
The Crown Prosecution Service is to announce its decision later on whether individuals and organisations will face criminal charges.