Actually £1000k extrapolates to about £5.5k pcm depending on pension contributions/student loan etc.
Presumably he pays mortgage and utilities, house insurance, car insurance and for holidays, etc. If you have a big mortgage all of that may come to £3.5k or thereabouts. We can't really know.
If he has £2k left and gives you £600 for food, car insurance, phone, everything for the dc, your clothes, hair, etc, yes that's beyond tight and bordering upon abuse.
When I was a sahm more than 20 years ago I spent about £750 to £800pcm on food, petrol, haircuts, children's clothes and had more for mine and things like the dentist, tumble tots, etc, although we did a lot of free park, had a season ticket for the museums that weren't free then and were bliss and coffee shops hadn't really kicked in. We went to each other's houses and toddler group for 50p. A mini milk was 20p on the way home.
My DH can be a selfish sod and did buy himself a wanky sports car without consultation but if I'd needed the dentist or a night out or the dc needed shoes it was encouraged and given freely. And neither of us are the last of the big spenders.