A new snake-like MHD mode localised at the plasma edge has been found in ELMy H-mode discharges with type-I ELMs on JET. The mode occurs in a wide range of plasma parameters and is excited by the perturbation of the ELM. It is located at the q = 3 surface and the magnetic spectrum consists of many harmonics. The mode numbers are n = 1, 2, 3, ... and m = 3, 6, ... . The mode is radially localised within DR 2-3cm , a poloidal localisation can be seen from the non-sinusoidal modulation of the edge ECE signal. A possible explanation is that this mode is a remnant of an island which is created by the edge ergodisation due to the ELM event.