Yes, I remember Fireball! Saving up my pocket money to buy the postal order, then patiently waiting for the pendant and survival guide. I also recall one of the first editions of 2000AD came with a cardboard wallet of some kind, can't remember the details. Didn't 2000AD have a story that was loosely based on the film Rollerball? Can't remember the name...
Prior to those comics, Whizzer and Chips, the Beano and the Dandy were what I spent my pocket money on (only one comic out of those of course, 7p didn't go very far back then). Loved the Bash Street Kids. I also seem to remember that there was a comic based on 'Plug' from the Bash Street Kids. The first couple of issues came with a Plug mask, and a plastic device with a mirror and a deck of cards with different pictures. you used to insert the card into the device and look at the card plus reflection (Harry Worth style??)
Oh, I also remember 'Cheeky Weekly'. Kenny Everett did the voiceover for the TV ad, and the first few gifts were joke items like a squirting ring and a plate wobbler.