Under the Package Travel and Linked Travel Arrangements Regulations 2018 in the UK, you have the right to cancel your holiday and receive a full refund if the travel provider makes a "significant change" to your booking. A significant change generally includes a shift in departure or arrival times by more than 12 hours, a change of the departure airport to a significantly different region, or a downgrade in accommodation quality. If the change is minor (such as a 2-hour flight delay), you are usually not entitled to a full refund, though you may still be offered an alternative. When the provider notifies you of a major change, they must offer you three options: accept the new arrangements, choose an alternative holiday of similar quality, or cancel for a full refund. In 2026, ensure you respond to these notifications within the specified timeframe, usually 7 days, to protect your right to a refund.