Your first point of contact in your search for your compaq instruction manual will depend on how old the computer is for which you require a manual. You may find a manual at compaq's website This link also has lots of manuals
If your manual is not available from the Compaq website then the telephone number you need to ring is 0845 2704000 who will advise you about your specific manual. You should also use this number for digital computer manuals as compaq now own digital.
Any manuals available directly from Instruction Manuals UK or from private sellers are listed below.
If you wish to write to Compaq then the address is:-