Former Whitehall adviser Patrick Rock has been bailed to appear at Westminster Magistrates Court on July 3 after he was charged over child abuse images.
Judith Reed, a senior lawyer with the CPS Organised Crime Division, said: "We have determined that there is sufficient evidence for a realistic prospect of conviction and that a prosecution is in the public interest."
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New 'smart ticketing' plans will also be introduced so travellers can receive automatic compensation payments for late trains.
The 41-year-old father of six died last Thursday - a week before he and the band had been due to begin touring in North America.