We did it! We got to episode 100! So in this week's episode, we're looking back on the last two years of Proper English, talking about the use of the word 'hundred' - and in this week's Idiom of the Week, one of our intrepid detectives appears to be unaware of a Red Letter Day. Like us on Facebook (properenglish2019), and follow us on Twitter (@properenglish4) or YouTube . Oh, and if you have a burning English grammar-related question, why not ask us on Instagram (properenglish2019), and we'll do our best to answer - or, if you're an email kind of person, and you have any feedback or suggestions for future podcasts, you can always contact us at properenglish@sapo.pt. You can find us on italki at  https://www.italki.com/alisondaviskurley or https://www.italki.com/davekurley. This podcast uses the following music as the opening and closing themes, and also for incidental music: Bright Wish by Kevin MacLeod Link: https://incompetech.filmmusic.io/song/3458-bright-wish ...and this is the Davidson and Roberts theme: Hidden Agenda by Kevin MacLeod Link: https://incompetech.filmmusic.io/song/3872-hidden-agenda License: http://creativecommons.org/licenses/by/4.0/ We've also used the following sounds from Freesound: Motorcycle start by roman_cgr and TaDa!.wav by jimhancock Both these sounds are licensed under the Creative Commons 0 License. Here's to the next 100!