Thanks @Harvey186 I discovered the factory reset in TWRP and did this before installing /e/ which worked perfectly. I was looking for a stock rom flash which I didn’t fancy, but then realised what TWRP was capable of and this worked fine. Among the numerous attempts to flash my MotoG I finally found one instruction which enabled me to successfully install TWRP and that was simply to rename to long file name for peregrine version and put simply “twrp.img” and using fastboot this finally worked for me. The error message of “mismatched partitions” apparently doesn’t affect anything. Perhaps this might help someone else attempting to flash /e/ on a MotoG.