Applying for ILR with old IELTS test results

[MYILR2019]

Hello, I am applying for ILR(5 years spouse route) . I have an IELTS academic test equivalent to B1 level for my GMC registration(Doctor) as well which i sat in 2011 and used for 2 successful applications.The test center is also in the list of approved centers. Now the online SET(M) form is asking for a SELT unique electronic reference number which is not given to the tests before 2015. how do i proceed with this ?
There are only 3 options for this question..
1) IELTS UKVI

ENTER SELT UNIQUE ELECTRONIC REFERENCING NUMBER which is not there in my test result..

2) DEGREE IN ENGLISH LANGUAGE PROOF

3) NONE
Should I select IELTS ? If so what can I fill in as SELT reference number?
or
Should I select none and submit my test results with the application?
OR
Should I sit a test again? bearing in mind my visa ends on the 18th of april2019.
Any help will be really appreciated.
Thank you