Well I am on the opposite situation , I got MEP but not BIL , you can raise a webform and order your GCMS notes to see what's going on, it may be awaiting review or they are planning to send further tests to do, or they didn't check it yet to update your application, so send a webform to tell them about the situation it may resolve the case, if it doesn't just order GCMS notes and take action from there.