Thank you tdracer, really appreciate the insight and given your explanation, it certainly makes sense why they aren’t categorised as LLPs - you learn something new every day! And in reply to aerolearner, having counted the blades in the 1B I came up with 109 - and 146 in the 1A so it’s probably not too far off the correct number given the double sources saying 147 in the 1A. Thanks both again