What exactly are you needing instructions for? Most bikes are just static frames with a bunch of aftermarket (Shimano, for example) stuff hung on them.
Everything on a common bike is found on just about any other brand of bike and the individual components are usually documented at the individual manufacturers' websites.
Places like http://www.parktool.com/blog/repair-help document many of the repair and adjustment procedures.
Google will find tons of How-to videos for assembly and adjustment.
You might find a Raleigh-specific manual for your bike here...
Answers & Comments
"Shimano 21" doesn't really narrow it down much.
What exactly are you needing instructions for? Most bikes are just static frames with a bunch of aftermarket (Shimano, for example) stuff hung on them.
Everything on a common bike is found on just about any other brand of bike and the individual components are usually documented at the individual manufacturers' websites.
Places like http://www.parktool.com/blog/repair-help document many of the repair and adjustment procedures.
Google will find tons of How-to videos for assembly and adjustment.
You might find a Raleigh-specific manual for your bike here...
http://www.raleighusa.com/downloads/