he would do it again if a company he worked for was involved in an "immoral" tax scheme

Jones said his career options had probably been damaged because prospective employers may see him as a troublemaker.

Jones left the company seven years ago but, like many Google employees, had copied his documents on to a memory stick because he had personal emails and photos among his work files. He has contracts, invoices and correspondence between Google and its customers in Britain, which have been seen by the Guardian.