If they are not used to UK life, they will need to be aware of how dense the traffic can be. I know that we may never go back to the daily commute, but I am aware that people from outside the UK used to be (pre-C19) astounded at our routine traffic jams.
So they may like to look at properties within walking distance of a train station, good bus services (ha!) or factor in a car journey to a train station and expensive parking.
I have only visited the US once. I had always assumed that those large and spacious houses were just on TV shows, but found lots of ordinary people do live in properties that we would think of as huge!
I'd also definitely recommend renting to begin with.