;D

thanks CT. I'm quite into big batch cooking actually and never cook fewer than ten curries at a time. It's just new, unproven (to me) recipes which I prefer to try on a small scale, before going into production so to speak.
Well ebayists will send you a kilo of sodium metabisulphite for less than a tenner so I'll give it a try on my six chips and see if I die or not.