How can I find Robert Mackay Donohue?

I am trying to find an old friend from 1999 called Robert Mackay Donohue originally from Glasgow he lived in London he was around 32 then and in 2000 he moved to 225 Manor lane, Lee, London... We later lost contact and I would love to get in contact with him just to say 'Hello' I have googled him to No avail I know he had 3 children at this time but unfortunitly I don't know much else....