I've been going since the 70's (as a teenager) and Cov was always a bit of a laugh. No one took them seriously, other than the Noel Cantwell thing, but we all went as it was local. Derby pretty much the same eventhough they were the darlings of Central TV sport and always seemed to be on Star Soccer. Notts Forest on the other hand was different, more menancing, more watch-your-back type of place and was, without doubt, the big regional rivalry until they struck up a love affair with Derby (which was much later). Older fans will confirm this, it passed down to me by my Dad and uncles.