For those of you without an Amazon Prime account (now opened up to Europe, including Ireland), there are a couple other ways to catch episode 1..

Anyone with KODI setup or an Android TV Box

Amazon Prime Instant Video addon setup:
https://www.tvaddons.ag/kodi-addons/...prime_instant/

Or else stream or download episode 1 from here as an MP4:
http://fmovies.to/film/the-grand-tour-1.ll623/1q7n0w