Doggerel: to a toy car

UCL department: 
Medical Physics
Entry: 

Sparkle, sparkle new toy car,
How shiny, bright and fast you are!
Mummy says I must not lick,
If I do I will be sick.
But you're sweet, you're oh so tasty,
Lick I do; my face turns pasty,
Now my stomach will not settle,
I feel the effects of heavy metal.
The doctor frowns and shakes his head,
And says that I must stay in bed.
I fear the outlook is not good,
My car should have been made of wood!