The longer they get [pen] To be fair, I read your opener about 12 times and couldn't get it to fit what I consider a limerick pattern. But as CdM says, we don't want to go down the road of another scansion war (see the York archives for what happens when things get really ugly).
I was only to blame Johnny Ball is a great man, and it is a tribute to him and to the dire state of contemporary children's TV that he would never make it today, on account of being over 12.
Not that that need preclude somewhere lying just south of that. And in any case if moi geographee be nart in the roight koinda areahh, there's definartlee one ah them thassavam exclumashion markie jarbies afer 'Ho'. Oh God I wish I hadn't grown up in Carrrnwalll...