Episode numbers missing

[Alan Milewczyk]

Running v2.91 on Win 7 x64. Not sure if it's something I've done but 
I've noticed that in the last few weeks where a TV episode used to have 
an episode number and name in the title field, now just the name 
appears. It's helpful for archiving purposes to have the episode number 
to enable correct sequencing when playing back. Not sure how to bring it 
back?

Thanks

Alan