What I--er--especially like about it is the subject.

You have written of something you know about, something close at home, so to say.

I--er--I am not much of a swimmer myself, but I presume that the instructions you have laid down here are--er--quite correct.

In fact, Edwards, I'll even go so far as to say that I fancy one might take this composition of yours and--er--really learn something about swimming.

And--er--if you have ever tried to learn anything of the sort--golf, rowing, tennis--from a hand-book you will realise that that is high praise." "Yes, sir.