Today Michael Portillo joined the amazing ATW 175-185 morphing train. Embarks a 175 at Flint but wait this interior is from a 2 car 185, cue ariel shot yep defo a 185, but NO disembarks in Llandudno from the 3 car 175 he got on in Flint. Now that is amazing. Top continuity from the Beeb again...I suppose they did get the trains with matching livery.
but it's still enjoyable to watch.
They've already explained that they only have limited access to a helicopter to take aerial shots and can't guarantee to always get the same sort of train. As to the interior being different, it might just be down to a problem with someone else on the train meaning that they had to record his speaking part again at a different time. The actual journeys are rather incidental to the overall story though, so I just try not to take too much notice of the continuity.