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A London children’s hospital that depends on royalties from the play “Peter Pan” may suffer on Friday, when the copyright on the famous J.M. Barrie play (and the musical) expires. Barrie, who died in 1937, bequeathed a portion of the play’s considerable royalties to the Great Ormond Street Children’s Hospital, located in London’s West End theater district. But on the expiration of the copyright, that source of income--estimated to be in the millions of pounds, although the exact figure, in accordance with Barrie’s will, has never been divulged--will disappear. Hospital officials said Wednesday they are unsure where the money to replace the Barrie legacy will come from.