The Inbetweeners font here refers to the font used in the title of The Inbetweeners, which is a British sitcom that follows the life of suburban teenager Will McKenzie and his friends.
The font used for the title of the TV series is probably FF Din Black designed by Albert Jan Pool. The font is a commercial one and you can purchase and download it here.
Download Din Font
The Din font identified above is not available for free, please follow the link above and purchase a font license to download and use the font. Meanwhile, you can take a look at our collection of fonts for cars, pop music and apparel as well as round-ups of new & fresh fonts around the web.