As suggested above, a couple more couplets have intruded themselves.
It possibly is still unfinished:

That dreaded time, alas, has come.
"Last orders" at the Broken Drum".

Now Nanny's songs will not be voiced.
There's no more scams for Mr Moist.

Dibbler's work at last is done.
There's no more "sausage in a bun"

Now Nobby : Samuel Vimes
No longer solve Ankh-Morpork's crimes.

The Watch have had their last back-hander-
"The Times" declares (this may be slander)

The Seamstress' Guild no longer sew,
They'll find another road to Ho.

The list of books will grow no greater,
As DEATH has met his own creator.

And, so we ring the passing bell,
             Sir Tel,
             Farewell!

Just waiting for the postman to bring me a Tee Shirt with a picture of Terry on the front & this on the back (in a suitable Gothic script)