The distance between your house and the local street cabinet. The quality of the copper or fiber wiring in your area.

For fiber-to-the-cabinet (FTTC) connections, plugging your router into a secondary telephone extension rather than the main master socket can significantly degrade speed.

If Plusnet cannot restore your speed to the guaranteed minimum within that 30-day window, they must allow you to cancel your contract immediately with no early termination fees.

Reach out to Plusnet via their online chat or phone. Explicitly state that your speed is below the "Minimum Guaranteed Download Speed" mentioned in your contract.