Update - It seems i have programmed two of the chips with headers.......
Quite how headered split files got into the folder i keep the files in, i do not know!
So, have split and ensured all files are correct. have broken down cart and will be reprogramming all 4 chips tomorrow, hopefully.
I managed to get a few pics to show what is happening with my .1 file in case it is needed. I'll upload them asap.