Travel / Travelling from NI to Poland [32]

Hello,

I am planning to travel to Poland (Wroclaw) from Belfast, Northern Ireland by a car which is Nissan Qashqai 2.0 (Petrol) and my question is which way is the quickest and most economical including ferrys.

I thought about from Dublin to Holyhead (but as I see on the map is Holyhead connected with England by a motorway that I can easily drive through ?) , then from Holyhead to Dover (England) and from Dover I have another ferry to Calais (France) and then from Calais straight to Wroclaw. Is that a good route ?

Thx in advance