Dickens never lived there so calling it his home would be incorrect - it was the home of the original Betsy Trotwood. I spotted that one instantly, having grown up in Broadstairs (and even had a job in the Charles Dickens pub next door), but if you look closely at the picture there’s a big clue... personally, I think Bleak House would make a better Broadstairs landmark, or the North Foreland lighthouse.
The church on Romney Marsh is the Thomas Becket in Fairfield, which is famous for still being there even though the village is long gone. Although strictly speaking it’s on Walland Marsh (so-called Romney Marsh is actually three separate areas - Romney, Walland and Denge).
https://en.m.wikipedia.org/wiki/Fairfield,_Kent