If two different books say two different things then people just have to form their own opinions.
My view is Jeremy went to his family asking for money to travel the world. He claimed it was to broaden his mind etc. But really it was to go on a big bender. Perhaps doing some short term jobs and petty crime. Neville & June agreed and financed this.
However when the financing stopped, the reality of life hit Jeremy. But Sheila was still being financed. . He thought he could do better than the farm. But could not. So reluctantly returned.
He soon thought of a way out....