So after listening to Windy's advice I decided to check the tuning of my clarinet barrels, first the 65mn and then the 62mm.
I was thinking that my top A sounds flat but not so in this test, although it seems more in tune when using the 62mm barrel. Clarinet being what it is though I don't always sound the same.
I'm using a free Android tuner called Soundcorset. It allows the player to compensate for transposing instruments.
Edit: the site isn't letting me upload files so I'm using a third party hoster.