Unfortunately, you have to choose the oldest episode manually.
To do this, when you’ve entered the programme folder and see the list of episodes on the left – these will look like ‘7 NOV’ – press the left arrow on your remote until one of these episodes is highlighted.
Now, press the up arrow until the oldest episode is highlighted, then press ‘ok’ on the remote, then right. When you press play epsiode, it will play the episode you have just chosen.
I hope this helps.