Bluetooth Auto-Connect

[Guest WearTheFoxHat]

If I leave Bluetooth enabled on my handset, and then turn on the car, then Bluetooth connection is instigated from my car to my phone and works perfectly.

However I've started using an application which only enabled my bluetooth when I am moving, this is great as it saves my battery ..... however it means that the bluetooth on my phone is enabled after my car has been running for a few minutes and thus the car does not auto connect to it.

Is there a way to make the phones bluetooth auto-connect to devices it is already paired with??? Via script or app??

TIA