TopReg.co.uk appears to be a legitimate website based on customer reviews. The site has an excellent rating of 4.7 out of 5 on Trustpilot, with many users praising its efficient service, clear communication, and quick processing of orders. Customers have reported positive experiences with the company's customer service and order fulfillment. However, there have been a few instances where customers faced issues with availability of registration plates, but these were resolved promptly. Overall, the majority of reviews indicate a reliable and trustworthy service.