University College London offers a range of mathematics courses with online access, including BSc and MSc programs. International students can apply for these courses.
The Times Higher Education provides a list of UK universities offering online maths courses, including the University of Edinburgh and the University of Manchester.
The Open University offers a range of mathematics and statistics courses with online access, including undergraduate and postgraduate programs.
The University of Oxford's Mathematical Institute provides information for international students, including online courses and programs available.
FutureLearn offers a range of free online maths courses from UK universities, including the University of Birmingham and the University of Leeds.
The Guardian provides a ranking of UK universities for mathematics, including information on online courses and programs available.
The University of Warwick's Mathematics Institute conducts research in various areas of mathematics and offers online access to research papers and courses.
The University of Edinburgh offers online and distance learning programs in mathematics, including graduate diploma and certificate programs.