Am I importing this car from the UK correctly?

I am purchasing a car in the UK and will catch the ferry over to pick it up.

I am looking at having a few days in the UK with the new car prior to getting the ferry back to Ireland and I will have it insured under my Irish insurance for this and will pay UK road tax to cover my time driving over there.

Is there anything else I need to be aware of or do legally to enable driving this UK reg car in the UK prior to bringing it back across the water to Ireland and the awaiting import process?

Thanks

Rob from Wexford