Yep, quite a few 'old fashioned' poisons not allowed for the last couple of decades.
1st one comes to mind is strychnine, been banned since the mid-late 80's, if my memory serves me right?
It was too haphazard, killing moles, then foxes, birds of prey etc etc, which fed on the carcasses of the moles, continuing the cycle of death.
Edited to add, Just checked, strychnine was banned in 2006!!
I was a tad surprised, definitely thought it was earlier than that?!