This trial will explore the feasibility and acceptability of an intervention for Somatic flashbacks in Post-Traumatic Stress Disorder (PTSD). Imagery Rescripting (ImRs) will form a central part of the intervention. The primary objective of this trial is to explore the acceptability and feasibility of delivering an intervention for the management of somatic flashbacks to a population of adults experiencing post-traumatic stress disorder. The secondary objectives of this trial will be to examine if the intervention leads to any differences in participants experience of somatic flashbacks and their global symptoms of PTSD.