This week I've spent £209.
But will go to a farmer's market tomorrow, supposedly just to get meat for the roast, and will inevitably spend loads on food we don't need because we are Greedy Gusses.
Have no budget as such. Choose to shop in Lidl because I think the overall quality is better than Marks and Waitrose. Granted there are a top slice of products (like fresh meat or cheese counter) that Waitrose has, that Lidl just doesn't, so you can't directly compare as the counter stuff is always better. But general shopping? 90% of items we genuinely prefer Lidl and are absolute converts.
Our £209 haul (two shops) includes food for 2 adults, 1 teen, and toddler twins who eat as much as the teen does 
We've got alcohol every night if we want it. Nappies and wipes. Ready meals for when teen needs to dash. Meat and fish (cook from scratch) for 5 most nights. Lunches for 4 for the week (only teen is out of the house during the day) a vast amount of fruit and veg, crisps, chocolate, freezer items, items for a fry up or eggs benedict/florentine for 4 each day.
Literally, halved our historic Waitrose bill. And eat no worse off. The chicken tastes no different. The steak tastes no different. The fruit and veg are actually better. Granted we don't have the choice of fancy grapes from Sicily, which might be superb, for a fiver. But we do have delicious Lidl green grapes for half the price of Waitrose ones, and always seem to last longer.
So our households food and toiletries for the week, comes in at £40pp. Which I think is fantastic really, considering that's 3 meals a day for 4 of us, and two meals a day for the other.