I don't know who sang it, but here's how I heard it:

One! Two! Three!
Beer, beer, beer, diddley, beer, beer, beer!

A long time ago, way back in history,
When all they had to drink was nothing but cups of tea,
Along came a lad by the name of Charlie Mopps,
And he invented a wonderful drink and he made it out of hops.

CHORUS: He must have been an admiral, a sultan or a king,
And to his praises we shall always sing.
Look what he has done for us: he's filled us all with cheer.
God bless Charlie Mopps, the man who invented beer.
(Beer, beer, beer, diddley, beer, beer, beer.)

The (your location), (another location), the Hole in the Wall as well;
One thing you can be sure of, it's Charlie's beer they sell.
So come along, my lively lads, at eleven o'clock they stop:
For five short seconds, remember Charlie Mopps.
(One... Two... Three, four, five) CHORUS

A bushel of malt, a barrel of hops, you stir it around with a stick:
The sort of lubrication to make your engine tick.
40 pints of wallop a day will keep away the quacks.
It's only 8 and 1/8 a pint, and one-and-6 in tax.
(One... Two... Three, four, five) (chorus)

Diddley, beer, beer, beer
And long live Charlie Mopps!