Sadly not shown on the OS ...
http://uk.multimap.com/map/browse.cgi?client=public&X=527500&Y=180000&width=500&height=300&gride=&gridn=&srec=0&coordsys=gb&db=&addr1=&addr2=&addr3=&pc=&advanced=&local=&localinfosel=&kw=&inmap=&table=&ovtype=&keepicon=&zm=1&scale=25000
No, and the stone itself isn't on this map of the park either. But you can see where to go. http://www.royalparks.gov.uk/parks/hyde_park/
Would you be able to see whereabouts it is on google earth?
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