iPhone 6 plus touchid fingerprint sensor stopped working after upgrade to iOS 10.3.1

I recently upgraded to the latest iOS 10.3.1 release on my iPhone 6 Plus. Before this the fingerprint sensor was working perfectly.

Now the fingerprint sensor completely fails to function. I cannot even register a new fingerprint.

I've tried turning off and on, synchronising with iTunes and holding Home + Power to force a reset. Nothing works. The sensor has simply stopped functioning after a software update!!

I'm sure it's not a hardware issue as Home button still works and sensor was working perfectly before the upgrade.

Anyone got any troubleshooting ideas please?