What? That's crazy! It's a real shame to not be on location in St. Pauls. It's a pretty important place in Britain's social history that deserves a higher profile instead of getting recast.
Odd considering Bristol is a popular place for filming TV/Movies because it's cheap and has a wide variety of modern/historic/shitty types of location that can work for period drama, gangsters or finance bros. ITV just has to do things in a shit way.