Ian Cameron, the prime minister’s father, had an offshore investment fund

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A huge cache of 11.5m files leaked from a Panama law firm are gradually revealing how oligarchs, celebrities and even criminals hide assets worth billions of pounds in offshore companies.

Deals with brutal dictatorships, sprawling property empires and cash from heists have all been funnelled through these secret structures under a veil of anonymity — until their dramatic exposure began last Sunday.

Mossack Fonseca, a law firm in Panama, has been revealed as the centre of this lucrative and secret industry, paid by its clients to set up companies which hide their mansions, cash and business interests in complex webs of shell companies.

The Sunday Times Data Team has now compiled