That's a lot of money what the hell is he buying?! Oysters, steak and champagne?
Yes the cost went up slightly as all the multibuy offers went. But it's more or less even out by now.
Are you all eating at home more than you were? Having lunch & snacks at home where you weren't before (but probably spending more on these than you would do use at home too)
Have you accounted for the money you're NOT spending on food & drink outside the home?
I have ocd & other conditions so my grocery bill for 1 person is high - around £70-80 a week, BUT if I adjust to discount those extra costs and only include the things I'd be buying if I weren't ill and it's closer to £40 so for 2 adults and a baby I'd not expect it to be more than £100 a week
Wow! And he's in the cheapest shops? Is it genuinely going on groceries op? Is he buying a lot of booze or "middle aisle crap"? Are you seeing receipts/proof?
I think a lot of it is alcohol yes. That'll be the most expensive thing is the alcohol being consumed? If so and it's a lot that's a different cause for concern - you say he drinks "far far too much" that needs addressed ASAP especially if you're pregnant
And food is being wasted? He needs to get a grip! possibly both of you do - what was wrong with the fruit and veg?
Head over to frugal foodies thread for ideas on avoiding food waste
On the food side I recommend the nest egg app for doing an inventory so he's not buying stuff you already have plenty of in AND you can note expiry dates and set up alerts to tell you something close to use by date
I find it hard to believe you're not capable of doing the shop, even if you know his meal plan. I wonder if he's persuaded you of this so he can buy more booze than you know about and hide it?