This reminded me of 'The Unrest Cure'. I googled it and found that the (anti)hero is also Clovis. Also discovered that at
http://www.eastoftheweb.com/
there is a huge repository of out-of-copyright short stories, including more by Saki than I had any idea existed.

But I shall not be greedy and wait for you to post them, at one every few months they should last a lifetime!