Nothing in this Act shall entitle the proprietor or a registered user of registered trade mark to interfere with or restrain the use by any person of a trade mark identical with or nearly resembling it in relation to goods or services in relation to which that person or a predecessor in title of his has continuously used that trade mark from a date prior—

(a) to the use of the first-mentioned trade mark in relation to those goods or services be the proprietor or a predecessor in title of his; or

(b) to the date of registration of the first-mentioned trade mark in respect of those goods or services in the name of the proprietor of a predecessor in title of his;