220s (4-car voyagers) are just called voyagers.
Anyway, that's the privatised railway for you: diesel trains running under the wires all of the way to their destinations
Yup. MCR247 is correct
221141 - 144 are 4-car SuperVoyagers. They still tilt and were ordered for the North Wales runs. Obviously they're completely unsuitable, like the rest of their siblings.
Stupidly, the 4-car SVs are split between XC and VT, XC have 1, VT have the other 3. No idea why. VT should have kept all 4 IMO, for use on the North Wales service as originally intended

As they bungled the original idea, the can suffer
NB I know it wasn't their fault entirely