Ken went over to help Kathy set up the easels.

However they all drew on pads they held?

Did I misunderstand or did CS wonder into Acorn Antiques territory last night?

And Easels and those large sketch pads are quite expensive too. Wonder where the Community Centre is getting its funding, seeing as no-one is paying for the classes. Maybe Kathy secretly has designs on hunky Ken Barlow... Or more likely when it came to actually filming the scenes it became clear the easels block everyone's faces.