I normally get new podcasts by doing the following on my iPhone:

1. Go to my list of podcasts
2. Select the podcast I'm interested in getting an episode for (e.g this week in google TWiG)
3. Select 'Get More Episodes'
This takes me to iTunes where I can normally see a list of all the episodes and download the ones I want. However, all I see now is the podcast logo (e.g., This Week in Google), 
how many reviews the podcast has had, but no list of podcasts.

I've tried deleting a podcast (by deleting all the episodes on my iPhone) and then trying to add it again via iTunes, but still no list of podcasts.

Where has the list of podcasts gone? How do I get them back?