#30: I would only say that his accent is vaguely northern
I agree. If I hadn't been told he was from Manchester, I would even have said "vaguely northern or Midland".
Fernschreiber picked out the two most characteristic sounds: those in Monday afternoon. (It’s similar when Dr C. says run faster.). I think I hear him pronouncing those same sounds in, on the one hand, gut, blood, but, money, number, stuff and does and, on the other, demands, after and nasty. That isn’t a complete list.
Also, fairly near the end of the recording Dr C. says everyone and one of the tips, pronouncing one to rhyme with don or gone. That is also typical of (all, or some of?) these regions.
However, there are (in my view) two possible northern pronunciations of the vowel in, say, gut or blood. In one, the words would rhyme with, respectively, put and good.* But what I hear in Dr C.’s speech is what I think of as an intermediate sound: I don’t know if there is a proper term for it, but I would describe it as being like a schwa.
At my schools in Nottingham and nearby, some people used the first and some the second type of sound. I’ve never heard or read anything about this difference, and I don’t know how experts would account for it.
*See, or rather hear, this recording featuring Andy Burnham. He is the mayor of Greater Manchester, but Manchester isn’t his home town. The interviewer is also a northerner.