Re reply 7. I think that NR means something like Not Rated or Not Recognised or something similar. It appears to be linked to some Ministry of Labour classification so maybe his civilian trade before entering the Army.
With regard to the casualty form in his documents, it should look something like the example in image one in the next reply.
Re reply 8. I cannot decipher the key word which appears to start with R or P. If it is P then possibly the word is Pioneer, but I am slightly dubious about that. The Pioneers were semi-skilled labourers who worked alongside the more skilled Sapper tradesmen. The following letter E? possibly stands for Engineer, ie it is an RE trade as distinct from the Pioneer Corps, rather like the assault pioneers within an Infantry battalion, or it is his trade/pay band EIII. Take a look at a similar example on this page from a service and casualty form for another Sapper in the second image in the next reply
The last line reads Pt [part] 11 to come, with the P in Pt looking very similar to first letter of the unknown word two lines above. Part 11 in this context means a Part Two Order which is the method a unit used to notify its parent record office of an event. You will see this recorded in the left hand column of the main casualty form - see image one below.
