We have 3 small children and all our bills food and petrol come to more than 2 grand and then theres uniform, activities, school trips, clothes, birthday parties, Xmas, holidays etc on top of that.
£2000 means different lifestyles in different parts of the country so hard to compare
Min only have logos jumpers but even with supermarket uniform, once you include shoes, lunch boxes, coats, water bottles, pe kit etc etc that's £150-200 per child a year, school trips etc are probably another £100 per child (rapidly increasing as they get older) plus normal clothes, shoes, wellies sanders, hats and gloves, coats, su hats etc etc.
Mine do ballet (£3.50 week x1, swimming £4 per week x2, beavers £3 per week x1, gymnastics £4 per week x1, guitar lessons £4 per week x1, violin lessons £1 per week x1 and th youngest hasn't started any clubs yet as only 3. School snacks are £20 per child per term, youngest playschool is £8 per week (top up to funded hours) school dinners is something like £80 per term but we do packed lunches
I would say £2000 would mean living very frugally, having to say no to a lot of stuff. We were like this for a while and I have to say it was miserable. We still have no money left at the end of the month but food in cupboard, things all paid for etc just run out of disposable cash. I definitely would not want to plan children on that income.