Abstract Background Delirium is a common peri-operative complications in older adults. It is associated with poorer outcomes including functional decline, increased length of hospital stays, increased admissions to long term care and higher mortality. Therefore, this project aimed to assess the peri-operative care of older patients admitted under the surgical service in accordance with the standards set by the Collaborative for Peri-operative Optimisation of People (CPOP) and British Geriatrics Society (BGS) Peri-operative Care for People Living with Frailty undergoing Elective and Emergency Surgery Guidelines. Methods The study examined four key aspects of the guidelines: (1) surgical staff training on delirium; (2) proactive screening in for delirium in surgical patients; (3) proactively documenting delirium and implementing delirium guidelines; and (4) documentation of delirium diagnosis in discharge summaries. Results Data were collected from 72 surgical admissions over a fourteen-day period, of which 26 patients were aged >65. Results indicated suboptimal adherence to the guidelines, with only 4/26 older patients (15.4%) being screened for delirium. Three of 4 of these patients screened positive for delirium using the 4AT. No patients had delirium mentioned in their discharge summaries. Additionally, a survey of surgical non-consultant hospital doctors revealed that only 4/16 (25%) had received formal training on delirium. Conclusion In response to these findings, interventions were implemented, including teaching at surgical grand rounds, hospital-wide education for World Delirium Awareness Day, introduction of delirium care bundles, and an updated discharge summary template for surgical patients to include a delirium diagnosis. A reaudit is underway to evaluate the impact of these interventions on guideline adherence and the peri-operative care quality for older patients. These initial findings underscore the need for improved staff education and adherence to CPOP and BGS guidelines. The reaudit will provide valuable insights into the effectiveness of the implemented interventions in enhancing the perioperative care experience for the older patient cohort.