Just before 9.00 on 2 June 2017, James Conwyn M P tweeted this, shortly before thinking Tweet in haste, repent at leisure. There had been over a thousand retweets before (as I imagine) it was taken down.
But the genie was out of the bottle. By midday, there had been well over 3,000 retweets.
Why did this happen? The Freudian slip theory. that he recognised Tory shortcomings and subconsciously wanted to "tell the truth", doesn‘t hold water (*KLAXON* Mixed metaphor alert: What kind of permeable bottle was this genie in?) Conwyn just wouldn‘t talk this way, whatever truths his id wanted him to admit to.
So was it a simple typo? Unlikely. If he‘s right-handed and a one-finger typist (fairly safe assumptions for a late middle-aged male WASP in the Conservative hive) typing a T takes much more effort than typing a P.
I favour a psycho-phonological explanation: what makes the strong and stable jingle so memorable is the alliteration of the cluster /st/. If the tip of the tongue is accustomed to hitting the back of the upper gums once per stressed word, the temptation will be to do the same even when the jingle has finished Hunt-and-peck typists vocalize the words they type. So the /p/ dissimilates to /t/ in the typist's voice and this change interferes with the fingers.
<digression type="Aha but...">In my efforts to find out more about Conwyn, I met this unexpected impasse:
So who is it with egg on their face? A real Tory MP or thousands of left-wing retweeters of a piece of fake news?
(Or me for overestimating the accuracy of the parliament.co.uk website?)