Right ... I've wimped out of the full replacement for now and have patched the joint with some horrible sticky stuff called weatherproofing tape made by evo-stick...
I will be replacing the boss when I have a little more time ...
I found out that the boss does move slightly up off the 110mm drain pipe but not enough to get off without having to remove the T-piece above the boss.
I also removed the straps from the boss so I could get the tape around the entire join. Hopefulyl it will hold for a while until I can spend the time to do a decent replacement job.
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