**TL;DR:**

Your current fixed tariff is ending **31 Dec 2026**. By **28 Nov 2026** you need to either:

- **Pick "Fixed Saver 27"** in your online account to stay on a fixed rate, or
- **Do nothing** and you'll get moved onto a **more expensive** variable tariff (34.1p vs your current 24.6p per kWh).

So yes — **set a reminder to act before 28 Nov 2026** and pick the new fixed tariff (or shop around). Otherwise you'll pay ~39% more per unit.