 Those who agree to take part in the study will be required to bring their signed consent form contained within the participant information letter to their second session or complete another one on the day before engaging within the study. Their second session will either be to complete the assessment processother formal measures documented below or start with EMDR treatment. This will be up to the clinician depending on how much information was gathered in session 1. This is within standard service protocol. Before treatment can begin each patient must complete the formal assessment measures. Only the 2 treatment sessions will use the recording equipment and following this they will continue with treatment without being part of the study. If at any point they decide that they no longer wish to take part, treatment will continue as usual, without the recording devices. 