Through many google searches and forum readings, I established that the Garmin HRM does not work with the Tacx Smart Turbo Trainer, so I ordered a Tacx heart-rate monitor. My new fitness lab had to have a working HRM if it was to hold its head up!
I also discovered that my Tacx:cloud account contained the data from all of my saved sessions, regardless of whether it sent me an email containing the data, which was great, although I’m not sure I trusted the set-up enough yet to switch the email transfer off. I downloaded the data and pulled it into an excel spreadsheet with a minimum of fuss. Despite all my set-backs, my small gains were giving me enough motivation to continue.
Summary of trials, tribulations & delights: