Some of the British big cats reported from Suffolk and elsewhere don’t match the description of any known species of big cat or wildcat. Some of these may be hybrids of different species of feline, or even hybrids of exotic wildcats and feral domestic cats. Such hybrids have been recorded in captivity and in the wild.
Mystery Animals of Suffolk looks at possible hybrid big cats. See also Hybrid Felines on the Messy Beast website.