Can tingling in the back when neck is bent forward be a symptom of ms? is it worthwhile visiting a physiotherapist even tho ms is suspected by gp?

May be helpful!: Tingling on movement of spine suggests mechanical compression or ay the least irritation. A visit to a physiotherapist could be helful as they can apply techniques to relieve compression of nerves and reduce the chance of further problems.

See neurologist: You describe Lhermitte's phenomena, which could be due to MS, but also other etiologies. This, plus optic neuritis, is MS until proven otherwise. Delay the physiotherapist, see a neurologist and get diagnosis confirmed and treatment started.