I'm looking for a schedule for Belfast Championship Dog Show in September. Usually fossedata have them but I can't find it any where?
Also I'm sure you don't but do you have to register your UK KC Dog with the Irish KC too? :/

Its just gone up on Fosse

Also I'm sure you don't but do you have to register your UK KC Dog with the Irish KC too? :/

No because Belfast is part of the UK so the IKC does not come in to it. :)

Not quite as simple as that, Marianne. Unfortunately!  Lots of shows in NI (and at the same venue in Belfast) are held under IKC rules. However, as you rightly say, Belfast Dog Show Society is UK KC so no need for IKC registration.