You must liaise with Help to Buy Wales, fill in their form (link below) and obtain an up to date valuation, before completion can occur.
You cannot remortgage or sell without doing this. Email HTBW on:
i have set out below the links you need:
POST SALES INSTRUCTION FORM https://gov.wales/sites/default/files/publications/2021-05/help-to-buy-wales-post-sales-instruction-form.pdf
POST SALES GUIDE