2 adults 2 teens 3 cats and about £100 a week here including cleaning/household gear. I manage to buy the bulk from Lidl, but always have to nip to Tesco on the way home for any bits that they didn’t have. It always astonishes me how much more expensive they are.
My top tips - meal plan. Its laborious at first but you soon get into it
Bulk up dishes with veg.
Batch cook and freeze where possible.
Use fresh foods before storecupboard - it annoys me when i have to throw veg out cos its gone off.
I freeze leftovers and we have ‘freezer surprise’ for tea 
Don’t forget your treats - even on a budget
Switch down a brand - The only ones in my family who get their preferred brand are the bloody cats!!
Frozen veg is cheaper and just as good as fresh.
Buy iceberg rather than salad bags that go off in a few days.
Meat free Mondays - meat is £££
I do keep searching for the famous MN chicken but haven’t quite managed to find one yet 