We shop at Asda and I do it online so there is less temptation to impulse buy and it helps me meal plan.
I choose the £1 slots usually 8-10pm but I'm going to be in anyway after the dc are in bed.
Then we top up with bread, milk etc.
I probably spend about £100 a week in food, household items and lunches.
I don't buy luxuries either just healthy stuff which is way more expensive than buying cheap crap!
Back to school was a nightmare it must have been about £300 for 4 x shoes (indoors and outdoors) logo uniform, bags etc.
We need a new washing machine, I need the septic tank emptied, dh's car is on its last legs, my leggings all have holes in, dd is outgrowing her trainers, its ds's birthday next week....it's never ending - I put the child benefit into a savings account each month and try to forget about it so when new things are needed I can have a backup.
I also buy second hand, so for ds birthday he has some hot wheels cars which he collects and a brand new set of hex bugs - both from Facebook site. The rest of the stuff is little things I've picked up from amazon and one of dh's pals gave him an old PlayStation.
So it looks a lot but cost very little - you just have to plan ahead.
To be honest I am weary of it. I can't wait to get back to work full time when the dc don't need me quite so much but it's so hard when school finishes at 2.30!