Personal preference whether you use a copy of the file or not.   I dont, the original is wrong I want it corrected, I dont need an extra wrong file floating around to get mixed up.  Some people like keeping the wrong original, I keep a printed copy, thats good enough for me

Auto debit of ES payments on s 1041?  never tried it, Id have to go look, but if you dont see the option, its probably not there.