I've published five books, available from all the usual online retailers and book shops.
Underground : USA is the photo book of my 2009 roadtrip driving around the 48 lower states of the USA.
Self published, 2011 - No longer available/in print
Tube Station Trivia - A fact for every Tube Station on the network!
Capitol Transport, 2018 - Available on Amazon and all other usual retailers.
The Railway Adventures - a book about the 2017 All The Stations adventure.
September Publishing, 2018 - Available on Amazon and all other usual retailers.
The London Underground : 50 Things To See And Do - An activity book for families and children, things to do on a day out on the Underground!
September Publishing, 2020 - Available on Amazon and all other usual retailers.
If you are after merchandise of T-Shirts worn in YouTube videos, these are all available on the DZTZ Merch website.