Middling for most of childhood, then relatively comfortable from mid-teens onwards.
Well-fed, but simple food (lots of fruit and veg, eggs, cheese, baked potatoes, pasta etc, cheaper cuts of meat in casseroles, but chicken was a treat, and things like individual yoghurts and kitkats were big treats).
Reasonable clothes but mostly second-hand or made by my mother. If anything was bought new it was always bought several sizes too big to get several years' use out of it. My mum cut both our hair badly and my Dad's.
Holiday every year but always in UK and usually camping. Occasionally my grandparents would gift some money and we'd rent a cottage. We never stayed in hotels or ate in restaurants, ever.
We always had a nice little pile of presents for Christmas and birthdays but they were relatively inexpensive things (books, colouring pencils) or things that we needed, like a new school bag. I did get a new bike one year though, which was hugely exciting!
My parents could never afford to buy new cars, or any new furniture. My dad made various beds, bookcases etc and when the cooker was beyond repair it was replaced with a second-hand one. We had central heating but it was used economically. Hot water bottles were in regular use during the winter!
I had a very good childhood. Despite money being a bit tight, my parents gave us a good range of experiences and plenty of attention. Plenty of picnics, playing in the woods, trips to the beach, painting in the garden etc. When they did have some spare money, they were more likely to spend it on taking us to the zoo, or on a day trip to London, than on buying stuff for themselves.