Sorry guys, thanks for the suggestions from you all!
Unfortunately I've only had time to ride it to work and back a few times and of course the darn noise won't come back??? Maybe a good thing? I've checked what connections I could without a noise to follow, they seem okay. I'm leary to run my bike for long in my garage as it's surrounded by apartments above, behind and to one side, soooooo afraid of my pipes getting complaints from the neighbors.
Still hoping it comes back so I can nip this thing in the bud!
Thanks for asking David!
Robert