What does a white cane with a red band mean at a Northern Ireland pedestrian crossing?

It may identify a deafblind person.

The Northern Ireland Highway Code rule 207 says a red-banded white cane, or a red-and-white harness on an assistance dog, may indicate deafblindness. Drivers should allow extra time and space and should not rely on horn signals to alert the pedestrian. Reduce speed and be ready to stop.