[Cantankerous One]

Originally Posted by Clan

looks good , to keep your eye on it look for the run of the belt over the tensioner wheel from the top .. keep a look for the belt getting very near the edge , it should run somewhere in between the inner and outer edge , when the tensioner wears ,the belt moves to the outer edge .

Thanks for the tip Clan.
Although (with a helping hand to fit the new belt - see my reply to Bulldogdrummond) it was indeed a straightforward job the only problem I had was in removing the tension on the old tensioner as the Torx bit just chewed up the small (T40?) torx tension releasing hole even when fully inserted. I ended up having to just lever the belt off the tensioner pulley without releasing the tension. I presume this was why it was changed to a T60 in the later tensioner.