Just to update this thread incase anyone else in in the same position and searches GFY...
I have found 'Smart Audiobook Player' which is ideal - Free for 30 days then $2.00 to continue using the full unrestricted version...
It does everything I want and more. It even rewinds ten seconds if it gets interrupted by a system alert from the phone while you are listening. Perfect
Its really very good and I highly recommend it