The latter seems to be becoming more and more common, including in quite serious contexts. I’m none too keen on that, though, because it reminds me much too much of the very un-serious expression “Tefler”, which is only one or two steps removed from “backpacker teacher”. Losing three capital letters could also contribute to the popularity of the hideous verb “to Tefl”. (Despite what most TEFL course providers would suggest, I believe the verb to describe what I do in my working life is “to teach”).

Time to start a campaign to save our capital letters before it loses its original meaning like the second word of “Cambridge Delta” (formerly Cambridge Diploma in English Language Teaching to Adults)?