What is Sir.P on about?
While this site doesn't permit the posting of information about car radio codes (because of the security issues involved) there's no reason not to help someone to get their new remote control to work with a particular device!
However actually finding the relevant code isn't that easy! Here's a list of codes used by Amstrad devices:
006, 204, 043, 036, 074, 002, 023, 026, 062, 065, 071, 094, 128, 410, 436, 451
And here's a list of codes used by Sky devices:
006, 195, 271, 300, 307, 308, 340, 341, 342, 343, 344, 391, 400, 421
So I'd start by trying 006 (simply because it's in both lists) and then, if necessary, experiment with the other codes listed.
Chris