Labour Leadership and the Glass Ceiling?

The Listener runs profiles of the five people who will be contenders for the Labour leadership. Cunliffe, Parker, Jones, Shearer & Little. There are no women.

Can any Labour people explain why Labour have gone from having a strong leader and a strong operations person as a leader to having no women as leadership contenders?

Did Clark rebuild the glass ceiling as soon as she crashed through it, or did she not bring new talented women into the house? And are there going to be any good women who can challenge for the leadership in the future?