Found myself in wrong country app store?

Hi Guys,
I was looking for an app the other day,
It took me to the UK store,
Had an update come through today,
went to update,
Message said I had to go to the store in the country where I bought the app

How to I get back to my Australian store?

Guess its simple, I just cant work out how?

Regards,
Gary

Thank you!

All Good!