Bike noise, creak, click, creaks, clicks, clicking, pinging sound - help

I know you have tested another wheel in the bike and there is no noise. To rule this out being a coincidence, are you able to test the wheel on another bike?

Good point. I'll try over the weekend. In answer to S Suffolk's questions: it disappears with the front wheel off the ground and is there whether ridden or pushed.
It can't be spoke overlap as its radially laced. I'm insure about the spoke head seating though. The wheel is 8 years old and done well over 10,000 miles wouldn't they have seated themselves by now and any noises arisen along while back?

Bearing preload sounds interesting. I read in Barnett's manual that cartridge bearings that weren't quite seated properly could make mysterious noises. Although why one or both should unseat themselves is beyond me. I think I'll replace them anyway.