Took Reids Furniture to Small Claims Court, rejected incorrect registred address!

I am speaking from experience and that is where I was told to address by the court. The local office sent the summons to their head office, otherwise you will have to travel to claims court where the head office is. It is up to the local manager, they sold the item to you.

Again that is not correct. You must sue them where their registered office is. If that is in Dublin or wherever so be it. The court of jurisdiction is where the contract was entered into i.e. where the shop is which may not be where the head office is. But the summons still goes to head office.