Is there any exceptional circumstances where you will be able to grade and promote between kyu's than the 3 month minimum it states on the BJA website? For example army judoka who train on week courses, 6-7 hours a day
You can apply for an exemption from the time requirement, but I think you have to do it on a grade by grade basis. http://www.britishjudo.org.uk/pdf/fast-trackproposal.pdf