This article nicely demonstrates the confusion often found in media coverage, between the issue of the gender pay gap and discrimination in terms of equal pay. 

Whilst reference is made to the pay gap in the article, what Ms Strachan actually appears to be talking about is whether the work of comparator is "like work"; "work rated as equivalent" or "work of equal value".

The evaluation of seemingly comparable jobs is often a vexed question for Tribunals, with many factors taken into account. 

Here, Ms Strachen appears to accept that although she and Mr Packham carry out similar work, with each enjoying similar airtime on the program, in reality, their jobs are not directly comparable, which would mean that there is no discrimination in there being different rates of pay.