I had my final interview in London on 3rd May and Ryan phoned me 1 1/2 weeks ago. I had waited 3 weeks and 3 days. I can't see why your security clearence would be taking so long but I still maintain that no news is good news.
I'm just having my medicals at the moment and haven't found them intrusive at all but I am booked in for lots of injections tomorrow which I think will probably be the worst bit!!!
Really hope that you hear from them soon. Fingers crossed for you xxx