This should apply to buyers owning existing property (in the UK or overseas) but who are buying a property to be their main home. For a £425k property buyers with an existing property pay £21.5k instead of £0 for first time buyers or £8.75k for those moving home. It should be same moving home.
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Examples would be young professionals living in expensive areas (for ex. London) and who couldn’t afford to buy in their areas and who decided to buy property elsewhere, for a second home or to buy to let, until they could afford to buy their main home.
Another example would be people who have inherited a property but do not live in that property and want to buy their main home. They may not have the ability to sell the property, especially if it is shared with other members of their family.