None of these are sacrifices, more borne out of opportunity and money-saving. The mend-and-make-do-attitude my grandparents had is the same attitude I've naturally taken on and I am glad my husband is the same.
So, where possible, my children have/ had second-hand clothes when younger, given to us by family and friends and likewise, we have given all our baby and toddler clothes, toys and prams to friends if they were still in a good state. For consecutive children, almost no new toys have been bought by ourselves and very few books - all passed down from older to younger children within the family. Most toys are wooden, because they are sturdier than cheap plastic. We make use of our local library.
We both don't buy many clothes, tend to go for well-made clothes, which last many years rather than fast fashion and I use stained/ un-mendable clothes to sew patchwork blankets/ coverings, toys or bags.
Broken items get repaired or re-purposed in crafts. Christmas cards and decorations get re-used or made into new ones, to give away again.
We buy second-hand furniture because we are too tight to spend £400+ on a new wooden cabinet when we can have a similar-quality one for £100 from a charity shop, but it helps we like old-fashioned styles.
I cook from scratch almost daily, buy seasonally and locally where possible - again, all of which is cheaper than imported, out-of-season and ready-made food. We also waste very little food, because we buy just enough to last us a week and I freeze leftovers regularly for lunches or days I cannot be bothered to cook.
I don't shop online much and prefer to walk where possible.
We use very little technology, so our energy costs are way below average compared to other families our size. Don't see the point and prefer to use our brains/ have a life away from screens. Our hobbies are naturally environmentally friendly as we walk, camp and are DIYers/ crafters.
I wash four full loads a week and dry washing outside using free sun and wind energy on a washing line, even when temperatures are low.
We also have bee-friendly plants, bird feeders and bug hotels, as well as a homemade compost heap.
Lots of little things, which all have an impact and mean that we, as a whole, are actually quite low-impact for an average British family.