4. In section 56(2), for the words from “his mark” to “confusion” substitute—
“the well known trade mark—
(a)in relation to identical or similar goods or services, where the use is likely to cause confusion, or
(b)where the well known trade mark has a reputation in the United Kingdom and the use of the other trade mark—
(i)is without due cause, and
(ii)takes unfair advantage of, or is detrimental to, the distinctive character or the repute of the well known trade mark”.