Please excuse my exasperation. Following the upgrade to iOS v5.0.1 I could not complete a pairing to any of my bluetooth devices. Previous to v5.0.1 they had been automatically pairing when in range of my iPhone 4S.
I had read many reports of this that were titled as specific to various models of bluetooth device. I thought it would be helpful to start a more generic thread.
I've done a hard reboot of the 4S which did not resolve the problem. I also deleted the connection entry on the iPhone and retried which did not resolve the problem.
However; then I did the next obvious step (which was not obvious to me immediately) and forced the Nuvi to forget/drop the connection for the 4S and the Nuvi has reconnected. Will also try on the other devices.
Forgive me for annoying you.
Alex