I'll reply on Ladyhawk's behalf as she's offline now.
I think this must be the familysearch beta website, operated by the Latterday Saints (also known as the IGI or LDS or Mormon website). Anyway, it's free to search - just put familysearch into Google and select pilot.
Then put in John Hunter, select Death/burials and enter the year and England
He was buried 8 Aug 1883 at ST Peter's, London, Kent (according to record)