I can double check on what exactly apply legally regarding ECE R44/02. If I remember correctly it is illegal to use seats certified ECE R44 rev.02 after 2008.
I find the issue of legality irrelevant, a car seat which is certified ECE R44/02 should not be used. I would strongly advice to safety discard the seat asap. Car seats in Europe don't expire but we recommend not using infant seats longer than 5 years and other car seats longer than 10 years.
Using a great, high quality rear facing ECE R44 rev 03 or 04 car seat for 10 years is fine if you know usage history, seat has not been in a crash, manual is available and the seat is in good shape.
A GoSafe seat would not be regarded as a high quality seat to start with and quite a few things have happened in the car seat market during the past 12 years.
ECE R44 rev.04 was introduced in 2005 and I believe ECE R44 rev.03 was introduced in 1995. Are you sure your seat is "only" 12 years old.....? Anything certified ECE R44 rev.02 is ancient and not safe to use.:twocents: