Right, it's working, thanks to both zentara and salva for gently nudging me in the right direction and apologies for the wetware error

It was me using the wrong format keys. Once I used the private key generated from puttygen's 'Conversion' menu and the public key from the 'Public key for pasting into OpenSSH authorized_keys file' file all works swimmingly.

Nick

In reply to Re^3: Net SSH2 auth_publickey not working in Windows by Badhedgehog
in thread Net SSH2 auth_publickey not working in Windows by karayan

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