_Food
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Do you cook from scratch? If so, bulk up the meals with more veg (bolognese with lots of mushrooms and onion) and freeze portions for another day.
Know your supermarkets discount times. For our Asda it's 9am for full stock then additional stock at 2:30pm and 6pm in the Whoops! yellow sticker aisle. I often find meat joints, chicken and mince I can freeze with £2-3 or so off.
Frozen veg is great. Not the mixed veg stuff but the cut up and frozen carrots, broccoli, spinach and leeks that you can keep for far longer than fresh and work to bulk up meals.
Pumpkins are everywhere cheaply right now and as well as great for carving with the kids the flesh is great for soups and pies.
_Cleaning & Household
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Add a small amount of fabric conditioner to a spray bottle with water for a cheap furnishing and air freshener.
Zoflora is great for cleaning - £1 a bottle and you use so little that it goes a long way once you dilute it.
Buy toilet paper in bulk. It feels like a lot when you're buying 24 rolls but you save money in the long run.
Asda Little Angels nappies or the Aldi ones are great and cheap (we spend about £2.50 a week) vs Pampers which are far more expensive