Don't buy coffees out, unless it's a special meet up with an old friend. Take a Contigo/flask for journeys/coffees out of the house.
Take pack lunch to work.
Best e-reader available on the market is small enough to fit in your credit card wallet... a library card
set a reminder on your phone so not to incur fines.
Shop at Aldi/Lidl... so much cheaper on general groceries.
Shop at the main supermarkets at yellow sticker time... bread & yoghurts & veg reduced to 10p.
Bulk meat out with beans/pulses eg kidney beans in chilli, scoop of red lentils in bolognese, cannellini beans in lamb stew.
Once a week, have a random meal of all the fridge leftover veg eg stirfry.
Also, one night make something super-cheap like lentil dhal or Jack Monroe's 9p kidney bean burgers.
Feed your freezer, not your bin. If you have anything that's going to expire soon, freeze it rather than chuck it out.
Homemade pizza costs pennies and tastes far superior to bought ones/takeaways. 250g bread flour, 150ml of handhot water, 1tsp dried yeast, generous pinch of salt & sugar, glug of olive oil, Value or Lidl mozzarella ball, tomato puree, toppings. Just mix & knead the dough for several mins on the worktop, place back in bowl, cover, put in warm place eg airing cupboard for 1 hr +. Roll out, put toppings on, bake for 7-8 mins in hot oven.
Get a copy of the Curry Secret/Takeaway Secret to make your own "fakeaways".
When your phone is out of contract, switch to giff gaff. Ask a friend for a recommendation & you both get credit as commission.
Look for jeans, jumpers, coats etc in charity shops. Big savings... you can get £50 jeans for £5.
When your jeans start to wear thin, sacrifice an old pair to patch up. Get iron-on bondaweb to mend those annoying holes in nice tops.
Wear a gilet, fingerless gloves & neck warmer and keep your thermostat around 16 - 17C.
Get an electric underblanket, turn the heating off and go to bed earlier in the evening & read a book/watch stuff on tablet. Only costs a few pennies per night, rather than heating the space in the whole house.
Sorry, got carried away and went well over 3 things. :)