https://www.gov.uk/guidance/academic-te ... udent-visa
213. You can study but you will need to obtain an Academic Technology Approval Scheme
(ATAS) certificate for the course/research and present it to your education institution
before you start your study if:
(a) you are over age 18 (or will be over 18 by the time your leave expires); and
(b) your course is one of the following:
(i) a doctorate or master’s degree by research in one of the disciplines listed in
paragraph 1 of Appendix 6 of the Immigration Rules, or
(ii) a taught master’s degree or other postgraduate qualification in one of the
disciplines listed in paragraph 2 of Appendix 6 of the Immigration Rules, or
(iii) a period of study or research in one of the disciplines listed in paragraphs 1
or 2 of Appendix 6 of the Immigration Rules at an institution of higher
education, where this forms part of an overseas postgraduate qualification.
Appendix 6 of the Immigration Rules can be found on the gov.uk
If your course (or research) completion date is postponed or delayed for more than 3
calendar months, or there are any changes to the course contents (or the research
proposal), you must apply for a new ATAS certificate within 28 calendar days, and must
provide a print-out of the new certificate to your institution promptly.
214. There is no limit on the number of hours you can study or level of course, provided this
does not interfere with the job you have been sponsored to do. You can study anywhere
you choose and you do not have to study with a sponsor registered under Tier 4 of the
points-based system.
I am not a lawyer or immigration advisor. My statements/comments do not constitute legal advice.