Janet has built up a very comprehensive list of these 'appearances' over the years.
What started out as a trickle is now a flood of sightings. Almost a week doesn't go by without someone spotting an appearance and Janet is 'tagged' to alert her of another addition to the list.
I suspect it is the popularity of 80's drama at the moment, and what better prop to anchor something in the 1980's than a Filofax!
The script writers obviously don't realise that there are a lot of us still using them 40 or more years later!
What do you do if you spot a Filofax whilst watching TV?