Who was Lily the Pink?

The Scaffold's hit from 1968:

We'll drink a drink a drink to

Lily the pink a pink a pink

The saviour of the human race

For she invented medicinal compound

Most efficacious in every case

Mr Frears had sticky out ears

And it made him awful shy

And so they give him medicinal compound

And now he's learning how to fly

Brother Tony was notably bony

He would never eat his meals

And so they give him medicinal compound

Now they move him round on wheels

Taken from this excellent book.

Hat tip: Jimmie