“It’s just snowballed really, thankfully for the charity,” he added.
BBC Breakfast viewers flocked to Twitter to praise the drawings as one shared: “Just the tonic.”
“I have really enjoyed this note,” another added while a third said: “Wow, cute.”
“They are fab, they remind me of the drawing on the old rhubarb and custard cartoon,” someone else tweeted.
BBC Breakfast airs daily on BBC One at 6am.