A major brand for you to choose or search.
Falcon a British Company focus their manufacturing on mountain and hybrid bikes.
80 years of experiance goes into their design to the extent that the legendary Eddy Merckx used bikes made by them. Some examples below:
Falcon Men's Progress Lightweight Alloy Rigid Mountain Bike - Blue, 19-Inch
Falcon Women's Enigma Rigid Mountain Bike - Blue/Pink,
Falcon Atom 26 Inch Alloy FS Mountain Bike - Mens.