Interesting how you say that Rob, as I don't recall a trial as such, but I too got upgraded to TRS22 PE around the same time! Your reskins look fantastic too! Perhaps N3V should bring you onto the team to speed up the process of making new liveries for the Mk1's,I aquired these BR Mk1 coaches via the Tornado DLC pack which I gained access to by being treated to a free trial of Trainz Plus standard that is due to expire on March 19th '24. Installing the trial promoted my TRS22 standard install to TRS22 PE thus giving me access to the Tornado pack. I think it was very generous of N3V to sign me up for the TRS22 Plus trial especially considering I didn't actually have TRS22 PE initially!
I'd be tempted to clone and try to throw my hat in the ring with the Mk1's too, but it's a bit baffling with the amount of errors that show up in Content Manager.
Regards,
Noah