For anyone wondering what kind of pen he's using, it's a Papermate Berol Italic Calligraphy pen, looks like large or extra large size nib. It's discontinued but if you search "5.0 calligraphy pen" you can find a very similar pen. Keep in mind that if you're adding color on top, you'll need to use waterproof ink.
Your videos bring such great insight into the techniques involved, so invaluable and generous. If only such things existed of Edward Ardizzone and Ravilious. You are a true marvel Sir Blake!
Their names are certainly helpful in suggesting what they might look like - since I was little I always imagined Hornswogglers as having horns like rhinos and Snozzwangers having long snouts. Obviously Blake thinks along similar lines!