Thank you all for your patience. I have now removed the cradle, and ascertained that it is for a Nokia 6100, 6610, 6610i and 7250i. Not that these numbers mean anything to me, but I can now go off and look them up
I have now looked into all of the above phones, and do not think I want any of them. I appears my current phone is a Nokia 6280, for which I have not been able to identify a cradle. I suspect a bluetoooth cradle will be the best way forward.
Thanks for all the advice and suggestions.