VAT to show in Checkout instead of Taxes

I am trying to get VAT to show in Checkout instead of Taxes. Everything else seems to be ok. The base country has been set correctly with base country the UK county and postcode. I have uninstalled and reinstalled several times I have also tried changing Taxes to VAT in the Language Files is there a way of doing this as it doesn't look right and customers will find it a bit iffy.

Many thanks
Paul