Dorothy, Here is the response I got from a horticulture guru regarding pollinators for your Holly:
english holly has a green or purple twig on the recent growth. Males of Ilex x meserve, Ilex cornuta, Ilex pernyi and Ilex x aquipernyi will pollinate it.
When buying a pollinator you need to be sure it's a male. Check with local nuseries for more information or try on-line mail order companies. Happy Hunting, Nancy