This is a very useful response thank you. I'll get the error codes. Really glad we don't need to join the MFi program.
Louis___
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I've tried to use BLE Scanner and 'LightBlue', I've also tried to pair from the system settings but don't get that option. I can connect fine.
With a pair of Bluetooth headphones I can connect to a device from the system settings and it transfers automatically into the my devices.
As per the Accessory Design Guidelines for Apple Devices link, it seems to suggest that I need to communicate with AT command and responses with the host device (e.g. iPhone). I'm working out how to get that running.