How to request a remark?

So I've just got my results and my leisure and tourism grade isn't as high as I would like - it's currently a C and only one mark away from a B. So I just wanna know how to request a remark, and does anyone know roughly how much they cost?

You'll need to request it from your examinations officer, and you can get an idea of costs from the links here: http://www.thestudentroom.co.uk/showthread.php?t=4270742