 DESIGN Each patient will receive an Eye Movement Desensitisation Reprocessing EMDR treatment session with eye movements EM and an EMDR treatment session without EM. Half will complete the EM session first and the other half will complete the no EM session first. After the first session is complete the patients will cross over to complete the other treatment session, which will be approximately one week later. This is known as a cross over design and allows patients to act as their own control group. Furthermore they will be randomly allocated into which condition they complete first to reduce order effects. During both treatment sessions patients will have their arousal levels digitally measured and face video recorded. 