I'm always trying to save money, by necessity but it's also a hobby!
Some tips / things I do. Explore any of your employer benefits schemes, for discounted gift vouchers etc incl. Supermarkets. Use all the shop apps AND have them on your partner's phone also & play them off against each other - loads of money to be made / saved here. Use MoneySavingExpert and Hotukdeals. Use cashback sites like Quidco.
Don't buy everything in one place if you can help it. Use Home Bargains and Savers for cleaning products and toiletries. Also use Farmfoods and Heron Foods if you have one - brilliant deals on good quality items. Know which shops do the best prices on the items you use most & stock up if possible.
Eat a mainly vegetarian diet. Use beans, pulses, lentils, pearl barley, oats, carrots, celery etc to bulk out meals - particularly stews and mice-based meals. Know where / when to find reduced items and meal plan around them. Batch cook.
At Christmas all the veg was 8p - we bought loads and prepped / froze. I did 2 bags of Jackets in one go - then defrost & crisp up as Jackets or wedges. I have just used 5 x Broccoli stalks, the last few small potatoes & the dregs of Stilton to make a soup.