It appears to me that Crosscountrys' 5-car Super Voyagers are mainly deployed on the South West services, both from North East England and Manchester, if it isn't simply the case that they are nothing but illusions created to mock passengers wedged into 4-car 220 sets

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I seem to have the great misfortune of not only regularly having little choice but to travel on Voyagers, but also of regularly ending up on 4-car ones far too often: Most recently today, on the 13:03 Birmingham New Street to Bournemouth (origin Manchester), which was formed of 220008. We left New Street keeping pace side by side with one of those fabled but rarely travelled on 5-car 221s which was working the 13:03 departure to Aberdeen, just to rub salt into the wound! There's seven trains per hour between Birmingham and Coventry, and the luck of the draw just happens to see me having to catch the one of those that I would have really rather not have been on! :roll:
I observed that around 90% of the seats in standard class were occupied, rising closer to 95% after International, with a handful of people choosing to stand in the vestibules regardless of the availability of single seats due to that anti-social British habit of not wanting to sit next to anyone else. While having pretty much every seat filled on a service clearly makes the best economic sense, this was right in the middle of the off-peak lull, and while XC is not as orientated towards business travel as other Intercity operators, it's shocking to think just how full those four carriage trains get in the peaks when you have that 95-100% loading of leisure travellers
plus the not insubstantial number of commuters between the provincial towns and cities added on top: If Crosscountry don't have the flexibility in their fleet to double-up the busiest services at peak times, then the Voyagers really need to be lengthened, even if this does mean carrying around a proportion of fresh air with a 65-75% loading off peak.
Though I will happily note that Crosscountrys' longer HST services do at least hit many of the major commercial centres along the XC SW-NE corridor during the peak period.