Anthony & Alasdair make it to Neil Penswick's debut novel, The Pit - one with quite a bit of reputation around it in Doctor Who fandom. 

With special mention to Power of 3's podcast interview with Neil Penswick: https://m.soundcloud.com/powerof3pod/262-the-pit?si=11de2a38b4934e9eacdbc2605e7c5e5a&utm_source=clipboard&utm_medium=text&utm_campaign=social_sharing