If Deccacolour isn't listed and a search has proved fruitless, I would suspect there isn't a code.

Chunghop make several remotes that include codes for Deccacolour . . .

• URC03


• RME82


• RM96


• RM366


• RM399C


• RM828


• RM860


• RM868


• RML977E


• RML987E

. . . but of course, the problem will be trying to find a supplier.

Update:

I've done a bit of searching and come across this site. It appears as though there's a bit of a link between Deccacolour and Tatung so it may be worth giving the latter codes a try, assuming there are some of course. Failing that the site does do Decca/Tatung replacement remotes. It might be worth giving them a ring.