Rural can also mean "country" in the strictest landscape-y way - not just UK prog bands influenced by a touch of US country music.
In that laid-back country sense, the first Genesis lp and Stagnation from the Trespass lp might just qualify.
Some rural bands: O Band, Quicksand, Chestnut Oak, Parlour Band....
lps that I have NOT heard described as being rural, but are to my ear (sans any US-influence whatsoever):
Amazing Blondell - the concept one (I forget title)
Strawbs - Dragonfly
most of Lindisfarne's output
Magna Carta - first & Seasons