Northern do not offer a catering service no.
When did that go? At changeover there was, I got a snack box.
Real annoyance: no Weekend First. I usually want to travel 1st on TPE/ex-TPE because of serious overcrowding, but see no need to do so on the longer VTWC leg, so would have to split at some additional cost (and restrictions).
The 1900 service from Manchester Airport is marked as standard class only on the website but conveys accommodation usually signed as First Class.
If it's timetabled Standard the usual convention is that it *is* Standard, though that is not written anywhere. I guess that one was planned as 156 or 2x153, or perhaps it's an error.