Specials on Sapphire TV

I can’t for the life of me get Sapphire to recognise my specials on tv shows.  I have no problems at all with the regular episodes but for series I own with Specials (The Office, Extras, Outnumbered, Ab Fab, Blackadder, Gavin & Stacey etc) I just can’t get it right - I have tried all kinds of variations i.e. S02E(last number plus one), S02S01, S02ES01 - I just can’t get any of them to work.

 

Can someone offer some advice on what I am doing wrong

Thanks

Scott