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I am in regular contact with Chris as he is the inspector for my Luton Minor rebuild project. I do not think Chris is to regular on the internet so probably has not seen this post. I will ask him about the "104" somtime in the next couple of days and reply with Answer.
I have spoken to Chris regarding the "104". This refers to the drawing number. He has told me that he has about 56 different designs and all have there own unique drawing. Obviously if you require more details on this you have to speak to Chris direct.