"Indie" or "alternative" or whatever you call it, is usually no different from mainstream genres. Maybe there are some arbitrary "rules" that the alleged radicals break, and people like me placed great importance on that in the 1980s. We treasured our outsider status.
I adore Colourbox, they had this particularly intense mix of both indie and mainstream. Lorita Graham is a superb singer, the Young brothers were bloody geniuses, renaissance men of pop. I am a fan forever.
From the comments (I stopped reading before I found one I disagreed with, only the true believers seem to be there):
Wow what an amazing archive find this is! Colourbox have never played live but here they are doing some (European? Location?) music event and miming a performance of this magnificent pop gem which would have been a massive hit if only the radio had played it. Their whole output has been exemplary and to this day remain hugely underrated (only M/A/R/R/S earned them some belated payback of course), but that first album and all the singles (and debut EP) they ever did are all pretty much essential. Been a massive fan ever since I first picked up that first album on tape in 1985, picking up everything on 7 and 12 inch vinyl and CD!