I'm pleased to say that the weather stayed well enough to get the idler pulleys, the tensioner, and the fan belt changed. There was some rattling and squeaking going on when the engine was started but I am happy to say that the noises have now gone. Silence is golden !!
When I took off the tensioner I noticed that the lower rubber bushing, where the bolt passes through, wasn't !! It seems to have disappeared. I have a feeling that the tensioner was allowing the belt to run slightly loose so replacing it obviously has its benefits.
The pulley wheels seemed OK but they were very black. The bearings still seemed to be in one piece but I would think that they haven't been replaced for years, if ever !!