Look at Ebay for everything first, before buying new.
Lots of Whoopsies. I deliberately go to Tesco at 10pm for this.
Heating set to 15o.
Breakup sets of books for Bday pressies.
Kids clothes from here or Ebay!
Own label or Smartprice on most groceries. Brnaded only if on offer. Not ashamed of Aldi or Lidl either.
Eggs from local farm - 75p for 6.
This sounds counterintuitive but - I do spend decent money on good quality clothes for me - so that they last and last. I don't midn getting them 2nd hand in good nick though. Not super designery, but good high street rather than Priomarni. I have a classic winter coat from Benetton that is now 12 years old and going strong. I have some work shoes from Next, 10 years old - also only on 2nd set of soles.
Never use the recommended amount of laundry powder, shampoo etc - always less, always works.
Book train tickets and flights (2/3 siblings live abroad) well in advance.
Sim only mobile phone deal.
No extra terrestrial TV apart from Freeview. Even box came from Freecycle.
Frecycle lots - as offered and needed.
PAss roudn clothes and toys with other mums.
Library rather than bookshop.