There are so many things I miss and lots of them have been mentioned already - roller skating with my best friend at the roller rink on a Saturday morning and then going back to her house to hang out with some teen magazines and some snacks. Top of the Pops on a Thursday night. The free range summers of my childhood - out playing as soon as we'd eaten breakfast and only coming home for dinner or (reluctantly) at bedtime.
Getting the bus into town on a Saturday to go shopping. You'd always meet someone you knew on the bus. Or you'd bump into them in the shops. Stopping for tea (coffee wasn't really a thing) and a cream cake to rest our tired legs.
Making home made witch costumes at Hallowe'en out of bin bags and a broom. Making Hallowe'en masks and decorations in school.
I miss the simplicity of a '70s/'80s Christmas. Home made Christmas decorations (remember paper chains?) and lines of Christmas cards hanging from a string of twine. Because we didn't get many treats during the year, the treats at Christmas meant so much more. We'd have a box of Tayto (didn't last very long with five kids), minerals (Coke, Club Orange, 7-up etc.), Christmas cake, pudding, an Australian Sultana cake, an Oxford Lunch cake, mince pies, selection boxes, big tins of Quality Street and Cadburys Roses. A box of jellies for my Nana (orange slices and lemon slices etc.). I know Quality Street and Roses tins are everywhere nowadays - and you see them in the shops anytime from August onwards. But we only ever got one tin, at Christmas. Once it was gone, that was it. So it was a real treat. And the chocolate tasted much nicer back then. The delights of toys and annuals. Buying headscarves, bath cubes and handkerchief sets as presents for your adult relations. We'd play lots of board games over the Christmas period and there would always be a jigsaw or two on the go. We'd watch the 'big movie' on Christmas Day. It was usually 'The Wizard of Oz' or 'The Sound of Music'.
I think what I miss most is the simplicity of life. My Mam was a SAHM so she dropped us to school each morning and collected us each day. No rushing around like a headless chicken dropping us off to creche and then dashing off to work. We'd come home from school, eat dinner, do our homework and just chill. We might watch a bit of TV or play a record on the record player. We read a lot of books. Dad would come home from work and read the newspaper. Afterschool activities weren't really a thing. Or at least, they weren't called afterschool activities and my parents didn't actively seek them out. My brother played football locally. He walked to his football training sessions himself (we didn't have a car) and I think the team travelled by bus if they were playing away matches. My parents never attended any of his matches that I know of. My sisters and I were in the girl guides. We met up once a week. Mainly we played games. We went on the occasional hike.
My Mam went to a Ladies' Club once a week. The other women were mostly all SAHMs too, so they were glad of the opportunity to escape from the demands of their husbands and children for an hour or two. There was a Musical Society and they put on musicals in a local hall.
There seemed to be a lot more human interaction. We didn't have a car, so Mam didn't do a big weekly shop (she'd never have carried it all home on foot). She bought bread and dinner ingredients every day in the local shops. She knew all the shopkeepers and would chat to the other customers. None of the women I knew could drive back then, so they would get the bus into town and have a chat with whoever they sat beside on the bus.
There was a lot less money but a lot more time.