Castlegate IT is a web development and consultancy company based in the historic city of York. From our city centre offices we provide quality web development, web design, search engine optimisation, Internet hosting and IT consultancy to business in York and beyond. We pride ourselves on providing simple, honest advice to guide you through the development process. We want our clients’ projects to succeed and we help that to happen. Previously known as Semlyen IT Consultants, the company has much experience in web development and many happy customers.