Habitat made some great stuff. I never thought Ikea was that radical at all, they initially filtered existing high-end design ideas down to a low-cost mass-market, though seem to have blanded-out over recent decades. Some of the earlier stuff is quite sought after now though. I actually have a couple of the more collectable examples:
I have three of those spectacularly uncomfortable ‘80s chairs and the red lamp thing. Can’t remember what they are called off the top of my head, but they are definitely worth way more now than what they cost. You can picture how ‘80s my flat was with three of the chairs, a black Xerxes, three-box Naim and black Kan IIs!