Muddy Fox mountain bikes were probably the first popular production mountain bike in the UK. In the late 80's and early 90's, they had a womens european MTB champion called Silvia Furst riding for them..she went on to race for Specialized.
I really wanted the Roadrunner bike, which was just below their Courier bike.
Not too sure what their current range are like, but I think there are better makes out there now.
Rich