At which university in UK can I study interior design?

London
Manchester Spalding Home & Garden College offers Design and Technology in Interior Design, which consists of both a practical and theory course.” Not only does this course help students with the theory behind interior design, but it also gives them hands-on experience. You'll be asked to research individual projects, market viability studies, renderings and 3D drawings for furnishings. In order to get a Certificate in the subject you'll need to complete a minimum of 4 courses or eight lessons (20 hours).

One of the top universities for interior design is East London University. In addition to an undergraduate degree, it also offers a postgraduate course in Interior Architecture and Design (IAUD).

Not only are these degrees intensively practical but they're designed to prepare students who soon-to-be start their career as a qualified professional; either as an architectural designer, or an interior designer. Through this education programme, students have a choice between three options from which they can glean everything they need in order to get started - be it architecture or design. They can learn about planning and design of buildings in relation to the interiors; how people use spaces on different scales both individually and culturally.

-here are some options for studying Interior Design at British universities. It's always best to explore the individual university pages for more details about their course and how they can help you in your career.
Westminster College provides a unique programme designed specifically to equip students with the skills needed to pass the NAF or BCS examinations, these schools provide a strong academic background in arts and design technology as an essential element of any interior designer's training.
Royal College of Art - A first class research institution, one that ranks amongst the UK's most prestigious institutions producing leading international designers who make a fundamental contribution to shaping understanding of our world and culture;
Howest University offers both BA (Hons) Interior Designer programme also offers MA.

There are many excellent design universities in UK, but the most common one is the Royal College of Art (RCA) in London. RCA was first established around 1837 and is credited with changing the field of design from being seen more as a craft to a profession.
Prior students who have studied interior design include Iekeliene Ruygenaite, Benedetta Tagliabue, Emir Kosutic, and Verner Panton among others.
The RCA has emerged as one of Europe's leading schools for interior designers since its inception over 30 years ago and occupies a strong position in a diverse sector which continues to grow apace globally.

There are 24 recognized universities in the UK that offer degree courses in Interior design. These universities include the following: University of Kentucky, Nottingham Trent University, Hochschule Der Kunste-Berlin - Berlin Institute of Art, Bournemouth University. This is not an exhaustive list and many smaller schools offer courses or modules in Interior Design as well.

A five-year Bachelor’s degree is generally recommended. In addition to their studies, all prospective interior designers should be introspective and competent communicators who have cultivated eclectic taste.

There are many great universities on the UK where you can study interior design.
Alumni in the field of fashion design have studied at St Martins College, University of Birmingham Institute-London Campus.
University of Central England - Birmingham Campus is another good choice—alumni include head designers for big names like Christian Dior. The Bristol School of Fashion also has an acclaimed Faculty for Fashion Design —students will learn about marketing, business management, merchandizing techniques, color relationships & a whole lot more from professionals who are experts in their fields.