We live in a bog Standard Victorian terrace and adopted 2 cats in October. They have totally moved in and seem very happy but young BoyCat (9 months old approx) has taken a liking to walking along the upstairs bannister rail, which terrifies me!
It's a small-ish drop on the landing side but a much bigger drop onto the stairs and he's had a few scrabbly near misses already, so does anyone have any tips on how to gently prevent him getting up there or should I just keep closing my eyes when he does it? 
Here he is, in all his mischevious glory!