Looks like a Raleigh Chill. The stays and lugs (blue painted stuff) is cro-moly steel which is bonded to aluminum (or should I say aluminium??) main tubes. Second to top bike with the Peak being the better bike with XT parts. Going strictly from memory, circa 1991 +/-. We actually took one in trade not too long ago and one of the local guys bought it to ride around town and was in the shop today with it.