Mentioned this in tags for a post yesterday but here's the letter on Geppetto's blackboard. Posted this on Reddit/DW ages ago, dunno if anyone ever fully transcribed it but here it is partially.

until I gave them one where an article was sold for £24 at a loss. X so much per cent. What was the cost price -- well, a member got £20 for the X so I retired badly wounded. Friend called at night school last Friday and told me he had seen you and survived -- so I asked X to remember(?) me to you which I hope the varlet(?) did. Have you learned(?) the little story of the German soldier who had his foot shot off and asked the Irish priest to carry him to the X. On the way a shell took off the German's head but [name?] went on X of the fact. X X, the C.O. said, "what's the good of bringing in a man with his head shot off, [name?]? His head, is it" says [name?] "He told me it was his foot"! So cheer up, [name? Arthur?] you'll soon be up and moving(?), and