how does free movement of goods have an impact in the United Kingdom?

Answer 1

It means we have many more of both exports and imports than if there were restrictions. Free movement promotes competition and specialisation and therefore increases consumer value for money and, over time, the standard of living.

Imagine how much more you would have to pay for your radio, mobile phone, shirt, pencils, washing machine, etc, etc, etc... if you had to buy ones made in the county you live in!