Most institutions who offer Higher National Diploma courses require some form of previous education, whether this is A-Levels or BTEC qualifications in relevant disciplines to the course you wish to study. Some however just require a strong work ethic and a competency in the English Language. The College of Contract Management requires no previous qualifications for their HND courses.
Visit,
https://www.theccm.co.uk/courses-page/hnd-marketing/