Hi WLY, our friends did a priority application and it took 16 days from date of the biometrics submission at VFS. It is critical to follow the instructions to the full as they will kick out anything thats casts any doubt. That is why we used an immigration consultancy service as they did all the hard work for us in preparation. They won't submit it until they feel everything is good to go. I think depending on your nationality is dependent on whether you need police clearance or not. My wife is Filipino and didn't require any police clearance or reporting to the police on arrival. If there is any criminal record it will affect how the application is handled but it may be a waste of money getting the priority service because it may possibly go beyond thirty days processing window if they need to follow up the criminal charges.