Detective Chief inspector Tony Heydon says the 30th anniversary of the murder of taxi driver John Landa is the perfect time for someone to come forward with a name so a conviction can be made.
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An NHS trust declined the £2,500 raised by a group of men dressed up as female nurses saying the costumes were "insulting".
The 15th century penchant was discovered by a metal detectorist just outside the moat of Kirby Muxloe Castle in Leicestershire.
Mohammed Ismaeel Ashraf died after suffering a severe allergic reaction but an inquest heard that he was not given an Epi-Pen straight away.