British rapper and TV personality Big Narstie has been unveiled as an ambassador for SlimFast, and co-stars with fellow ambassador Kelly Brook in the weight loss company's latest ad campaign.

Narstie, whose new single Work Hard, Play Hard features as the soundtrack to the ad, commented 'Eight years ago I collapsed after Celebrity Bake Off and that's when I began on my fitness journey and got into mixed martial arts. SlimFast is not a pocket breaker and a big thing about changing your lifestyle is being able to afford it'.