Apparently all BBC comedy panel shows will have a woman on them reported here.
I really don't know whether this is a step in the right direction. It seems at the moment that when shows have a woman on the panel, they only ever have one. I think that this policy might improve things (by having at least one). But I think it might entrench the tokenism of having only one woman on each show, in a "we've booked our woman, who else are we going to have on" way.
I also sometimes wonder whether there is an element of racial tokenism in comedy panel shows, where you tend not to get more than one comedian from an ethnic minority.