A Little Quiz

For those limbering up for a  new series of University Challenge here's a quiz to help get you into the swing of things. Warning, bearing in mind Mr Paxman's recent strictures about 13 year olds, this may be too hard for conservation industry managers.

The question is about Blacka of course and it's this:

These pictures all show the same part of Blacka. Here goes:

Which of these photographs were taken in 2010 when there was no cattle grazing on Blacka, and which in 2014 after cattle were brought on?

ONE

 

TWO

THREE

FOUR

 Answers via email please. The tie-break task is to complete this sentence in less than 12 words:

I think crop and cr*p grazing is ............................................................

T&Cs apply.