Anthony Taylor is from Manchester but gets Manchester teams, it doesn't work on postcodes any more and rather who the referees support. Mike Dean wasn't allowed to referee Liverpool or Everton previously, and famously was removed from a cup final as a result. This was due to his Wirral postcode but now he can officiate them as he supports Tranmere and therefore has no affinity to either Liverpool or Everton. I know Anthony Taylor supports Altrincham, no idea who Chris Kavanagh supports but it can't be Man City otherwise he wouldn't be refereeing them and for the reason below it won't be Man Utd either.
I believe they also apply it to rivalries. So as an example, a Man Utd fan wouldn't be able to officiate Man City, a Liverpool fan not Everton, a Wednesday fan not United, etc. I would guess that Pawson has declared that he supports either Wednesday or United and therefore is precluded from both of their games.