Finally tracked down the creaking noise that's affected my Triban for the past couple of weeks.
Started with the usual suspects - re-tightened every bolt on the seal post, stem, chain rings, derailleur, brakes, mudguards, etc with no result.
Checked the cranks - rock solid so not the BB.
Rear wheel tight in the frame, no loose spokes and cassette fully tight. Front wheel appeared to be solid in the frame but, while checking the spokes there was the creaking noise - not loose spokes but the wheel turned out to be fractionally loose despite the QR feeling correctly tightened. Only a quarter turn of the nut was required and peace has returned
At least it's had a full service and now just needs a clean and lube.