I guess you mean for a universal remote. (It's a good job that the force is with me today - having to guess half of your question.)
It depends on the remote so you need to ask the manufacturer of the remote.
If the force has failed me and you mean some other codes, Matsui is is a DSG (Dixons/Currys/PC World) Own Brand and so you should give them a try. www.thetechguys.co.uk
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix dtt receivers.