I have no idea in which order these 3 were published and the British Origami Society site doesn;t help here either. Moreover: they no longer have a #7 anymore :-)
https://www.britishorigami.org/wp-content/uploads/2021/10/Available_Folding_Catalogue_2021_v1.pdf
For me #7 probably is their most IMPORTANT publication as chess is anothe passion of mine ;-)
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