Hello
Every make is different but to achieve that look I use my large GHD and then run my fingers through the hair once I am done doing all the curls. You want to look for something that is roughly 3-5cm in diameter so that you can get more of a wave rather than a curl. Once you have done all your curls separate them, take individual strands and re-curl them slightly to give you the same effect as Blake’s. You can finish this off with a hair oil or a setting spray.