Text Editing of Options / Grand Total – on Woocommerce Product Page

Does anybody know how the change the following text elements at the bottom of the product page where the Grand Total / Options Total is?
Any help would be much appreciated.

I would like to add VAT details, I know how to do this for the product price itself but not the total lower down….for example change from:

Grand Total: ￡xxxxx

to:

Grand Total including VAT: ￡xxxxx

Many thanks.