too funny.
I love mumsnet. Thank you everyone for contributing to what is, let's face it, a very very dull subject indeed. 
I was only asking about the size. That's all. Not asking about whether I should be making them, or anything else. I am perfectly happy with my choice there. Wasn't part of my question.
But I don't mind at all people asking. It's only a question. I have answered it though. I don't mind answering it again, it has become a long thread and I know sometimes it's a pain to scroll back and forward.
I didn't put it in the op because it was totally irrelevant to the question I was asking. But I was and am happy to answer anything people feel they want to know, my replies above were
"Yes they are old enough but this is easier for me. I won't bore you with the details but due to their sn everything takes ages and is a faff and I have enough of that and I just want to Chuck sandwiches in a freezer and be done with it
"
"Because they cant always tell when they are full. My youngest in particular compulsively eats and isn't able to regulate himself. My husband eats like a pig (and stays slimish at me the git ) and thinks they should have as much as they want and I wanted an outside view because sometimes it's nice to reachinto the main world and see what other people think. Just to keep an idea of what's 'normal' (with big '' on) "
"I just want to get them in the freezer and be done.
I cannot be doing with the faff, the mess and the rows.
My youngest also held a knife to his throat last week because I wouldn't let him have a third bowl of cereal and I just want to get on with it.
They can make food. They do make sandwiches. I facilitate them cooking meals, I get them to do household chores, I am currently working on independent bus trips with my eldest (and I am having dailypalpitations I can tell you grin )
It purely is that just once I'd like something to be quick and easy and to just get it out of the way.
If I dropped off a cliff tomorrow they would do perfectly well without me
"
"The knife thing is not poor me grin it's just that you take your life in your hands when you pass my youngest a weapon grin even if he's happy he'll be in the kitchen dancing away and waving stuff around. "
"I would LOVE to have a dil to complain about my sons. I would make her sandwiches too if she wanted. grin
However, the future for my children will not likely include a wife. Or children.Or a high flying career. Or a mortgage.
My eldest can look forward to a flat probably if he gets sw to come in and make sure everything's ok. My youngest will live his entire adult life in a group home with 24/7 support.
That of course was completely irrelevant to my question, which was a simple gathering of views on lunch size, so there was no reason at all to explain it in my op since I wasn't seeking opinions on whether I should make their lunches but you can never tell what people are going to ask, so I've answered everything that's been asked."