From "Of Human Bondage".
Blackstable was a fishing village. It consisted of a high street in which were the shops, the bank, the doctor's house, and the houses of two or three coalship owners; round the little harbor were shabby streets in which lived fishermen and poor people; but since they went to chapel they were of no account

It seems logical that "high street" means the main street
because it was the only one that had been raised and paved to be able to withstand heavy traffic in wet weather.

I haven't been able to find a discussion of "church vs. chapel". Perhaps some of our UK members can tell us which
refers to the Anglican church, and which to the Baptist,Methodist,etc. denominations.

The rest of the paragraph goes on to make it clear that
"chapel" people were lowbrow Baptists,Methodists,etc.