Hi Jill,
I think Alfie may be the same in some ways. Although she does talk, she prefers to whistle and mimic sounds she hears - phones and beeps etc. We try to keep whistling to a minimum in our house, but David is a chronic whistler and it drives me nuts, cos I think as long as Alf is being encouraged to whistle, she'll do that rather than talk!!
Julie's right, if you just keep talking at him and resist whistling, Harvey'll be talking in no time!
x