START: After we were married I played in...

START: After we were married I played in the various championships and Margot tagged along. I think she found it all a bit much. Hospitality — outside this country — can be pretty exhausting. When we got back she tried to persuade me to give up tennis and play husband instead.
[... …]
END: That seemed a far more sensible idea — and just as I was working out how I could do it — I suddenly saw something which completely changed my mind. (Pause.) I didn't go to that tournament after all. When I got back she was sitting exactly where you are now. I told her I'd decided to give up tennis and look after her instead.

For full extended monologue, please refer to clips or the script edition cited here: Frederick Knott, Dial M For Murder, Dramatists Plays Service Acting Edition, p.27.