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Introduction Patients with inflammatory bowel disease (IBD) are at increased risk of colorectal cancer (CRC). The 2025 British Society of Gastroenterology (BSG) IBD surveillance guidelines advocate risk stratification and separate surveillance pathways for patients with and without dysplasia. We aimed to assess factors associated with dysplasia detection during IBD colonoscopic surveillance.Methods We conducted a multicentre trainee led retrospective study of adult patients with IBD undergoing CRC surveillance between January and June 2024 at 17 United Kingdom centres. Patients were identified from a combination of endoscopy and clinical databases. Data on patient demographics, diagnosis, endoscopic procedure and dysplasia detection were obtained from electronic patient records and analysed using Stata software.Results A total of 1489 patients were identified with a median age of 54 years and men accounted for 51.1% of patients. Patients predominantly had a diagnosis of ulcerative colitis (n=994), followed by Crohn’s disease (n=409) and IBD-unclassified (n=86) with primary sclerosing cholangitis seen in 9.0% (n=134) of patients. Of the 1489 surveillance procedures, 748 (50.2%) were performed using high-definition white-light endoscopy (HD-WLE), 725 (48.7%) using chromoendoscopy, and 15 (1.0%) using virtual chromoendoscopy (NBI/iScan/FICE).For dysplasia, 157 patients were removed from further analysis due to missing information. Dysplasia was detected in 126 (9.5%) patients including 5 (4%) with high grade dysplasia, 2 (2%) with CRC and 119 (94%) with low grade dysplasia. Among patients who had good or excellent bowel preparation as well as quiescent or mild disease activity, chromoendoscopy had higher dysplasia detection (60/493) compared to HD-WLE (30/324) but this was not statistically significant (p=0.24).On multivariate analysis, withdrawal time ≥ 15 minutes (OR 3.37; 95% CI 1.94-5.85, p<0.01) had higher odds of identifying dysplasia than <15 minutes. Increasing age was also associated with dysplasia, with higher odds in patients aged 50-75 years (OR 3.20; 95% CI 1.93-5.31, p<0.01) and ≥75 years (OR 4.98; 95% CI 2.55-9.71, p<0.01) compared to those aged <50.Previous dysplasia/neoplasia was a strong predictor of dysplasia, conferring a fourfold increased risk (OR 4.05; 95% CI 2.20-7.46, p<0.01).Conclusion In this multicentre UK study, dysplasia detection during IBD surveillance was driven mainly by patient risk factors and procedural quality rather than the endoscopic modality used. Older age, previous dysplasia/neoplasia and longer withdrawal times were independently associated with higher dysplasia detection rates. These findings highlight the importance of optimising surveillance quality and focusing on higher-risk patients in line with the recently updated BSG IBD surveillance guidelines.