I think it's pure luck at moment, my 2 year ban is due up on 8th November, I did DD course so I could have been able to drive from 22nd May but no medicals from mid March, only got my medical last week even though the doctor who saw me said she'd been doing DVLA medicals since mid July so I feel like doing DD course was a waste of time, realistically might get my licence back in next week or two by which time I've been realistically banned for 2 years instead of 18months. If I were you I'd just keep chasing DVLA