The Bengal shown on the IAMS advert is a brown spotted bengal. Try the 'Bengal Cat Club of Great Britain, or the 'Bengal Cat Club' or the 'Ocicat & Bengal Cat Club' in your search engine these are the clubs in Britain.
Created in the '60's when it was discovered that the Asian Leopard cat was immune to feline lukemia & experiments were started to see if the gene could be transfered to the domestic cat. However this research became obsolete when an immunisation was developed. An American lady called Jean Mills (Millwood prefix.) took over the cats & went on to develop the breed. Imported into the UK in the '80's. They come in spotted ( rosettes & arrowheads are highly desirable) or marble patterns, brown, snow & silver colour varieties. A wild looking, medium size cat of athletic build. Great climbers, love water, can learn to retrieve & are super with kids.