The clearest explanation we've seen, courtesy of This Is London: he exercises his right-to-buy on a council flat in Hammersmith, spending £75,000. After three years, he applies to the Land Registry to have the property transferred into his son's name. The property's sold in September 2004 for £228,000 and, with the assets, his son buys a semi in Greenford for £280,000. Apparently, shortly afterwards, the assets are returned to Hamza.

Hamza's prison property deals [October 12, 2006]
Hammersmith estate agents... own up, which one of you acted for Abu Hamza? [February 10, 2006]

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