It may come as an unwelcome shock to some of Comment is free's older readers that David Bowie's seminal Ziggy Stardust record is 40 years old this year. It is to be commemorated later this month with a plaque in Heddon Street in London, where Bowie was first photographed as Ziggy.

Plaques to commemorate fictional characters are increasingly popular: Lara Croft, Harry Potter and Sherlock Holmes all have their own. We'd like to hear readers' suggestions for who to add to the list and where their plaque should go.

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