The version we sang at school in Leeds in the 1950s was:

We are all King George's men (sometimes it was Saint George)
We are the English
We are all King George's men
We are the English army

We are all St Patrick's men
We are the Irish
We are all St Patrick's men
We are the Irish soldiers

Do you want a cup of tea?
We are the English
Do you want a cup of tea
We are the English army

We don't want your lousy tea
We are the Irish
We don't want your lousy tea
We are the Irish soldiers

Are you ready for a fight?
We are the English
Are you ready for a fight
We are the English army

Yes, we're ready for a fight
We are the Irish
Yes, we're ready for a fight
We are the Irish soldiers

General mayhem ensued as the two lines attacked each other and that was the end of the game. I had no idea it was so old. I recognised the Midi tune given at the top of this thread as the same one we marched to. This game has gone down extremely well with my nephews and niece, born in the 1990s.